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If you're after a house rule which clarifies what you can and can't do with Minor Conjuration, I'd suggest following the example of the fabricate spell (PH p. 239 / SRD p. 140):

You also can’t use it to create items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor, unless you have proficiency with the type of artisan’s tools used to craft such objects.

So allow the conjurer to create anything they could otherwise have crafted for themselves, given time and nonmagical materials. Backgrounds providing tool proficiencies become an an important differentiator between one conjurer and the next.

Under the "if you could craft it, you can conjure it" house rule, the answers are as follows.

Could you create your own spellbook?

In short, yes -- as long as you could have conjured a blank spellbook to start with. While a blank spellbook would normally be an item that requires a high degree of craftsmanship, it doesn't actually need to be. It might be (PH p. 114):

[...] a loose collection of notes scrounged together after you lost your previous spellbook in a mishap.

All wizards can craft spellbook pages given just paper and ink, so no further tool proficiency is needed to craft "a loose collection of notes". If the conjurer happens to have relevant proficiencies (e.g. with calligraphy, forgery, or leatherworking tools) this merely allows conjuring a nicer spellbook.

Minor Conjuration could thus create a spellbook containing any of the spells the conjurer currently has memorized, since (PH p. 114):

If you lose your spellbook, you can [...] transcribe the spells that you have prepared into a new spellbook.

If the conjurer has one of her own spellbooks at hand to refer to, she could also duplicate any spells from that book.

Could you create the spellbook of a powerful wizard?

If the powerful wizard is you, then yes. :)

Otherwise, even with the powerful wizard's book in your possession, Minor Conjuration cannot duplicate spells within it, since undeciphered spells cannot be transcribed.

What about the Keen Mind feat?

According to the accepted answer for "To What Extent Can The Keen Mind Feat Replace a Wizard's Spellbook?", Keen Mind would allow Minor Conjuration to duplicate one of the conjurer's spellbooks entirely from memory, provided they had read its entire contents within the last month.

If you're after a house rule which clarifies what you can and can't do with Minor Conjuration, I'd suggest following the example of the fabricate spell (PH p. 239 / SRD p. 140):

You also can’t use it to create items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor, unless you have proficiency with the type of artisan’s tools used to craft such objects.

So allow the conjurer to create anything they could otherwise have crafted for themselves, given time and nonmagical materials. Backgrounds providing tool proficiencies become an an important differentiator between one conjurer and the next.

Under the "if you could craft it, you can conjure it" house rule, the answers are as follows.

Could you create your own spellbook?

In short, yes -- as long as you could have conjured a blank spellbook to start with. While a blank spellbook would normally be an item that requires a high degree of craftsmanship, it doesn't actually need to be. It might be (PH p. 114):

[...] a loose collection of notes scrounged together after you lost your previous spellbook in a mishap.

All wizards can craft spellbook pages given just paper and ink, so no further tool proficiency is needed to craft "a loose collection of notes". If the conjurer happens to have relevant proficiencies (e.g. with calligraphy, forgery, or leatherworking tools) this merely allows conjuring a nicer spellbook.

Minor Conjuration could thus create a spellbook containing any of the spells the conjurer currently has memorized, since (PH p. 114):

If you lose your spellbook, you can [...] transcribe the spells that you have prepared into a new spellbook.

If the conjurer has one of her own spellbooks at hand to refer to, she could also duplicate any spells from that book.

Could you create the spellbook of a powerful wizard?

If the powerful wizard is you, then yes. :)

Otherwise, even with the powerful wizard's book in your possession, Minor Conjuration cannot duplicate spells within it, since undeciphered spells cannot be transcribed.

What about the Keen Mind feat?

According to the accepted answer for "To What Extent Can The Keen Mind Feat Replace a Wizard's Spellbook?", Keen Mind would allow Minor Conjuration to duplicate one of the conjurer's spellbooks entirely from memory, provided they had read its entire contents within the last month.

If you're after a house rule which clarifies what you can and can't do with Minor Conjuration, I'd suggest following the example of the fabricate spell (PH p. 239 / SRD p. 140):

You also can’t use it to create items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor, unless you have proficiency with the type of artisan’s tools used to craft such objects.

So allow the conjurer to create anything they could otherwise have crafted for themselves, given time and nonmagical materials. Backgrounds providing tool proficiencies become an an important differentiator between one conjurer and the next.

Under the "if you could craft it, you can conjure it" house rule, the answers are as follows.

Could you create your own spellbook?

In short, yes -- as long as you could have conjured a blank spellbook to start with. While a blank spellbook would normally count as an item that requires a high degree of craftsmanship, it doesn't actually need to, since a spellbook might be (PH p. 114):

[...] a loose collection of notes scrounged together after you lost your previous spellbook in a mishap.

All wizards can craft spellbook pages given just paper and ink, so no further tool proficiency is needed to craft "a loose collection of notes". If the conjurer happens to have relevant proficiencies (e.g. with calligraphy, forgery, or leatherworking tools) this would merely allow conjuring a nicer spellbook.

Minor Conjuration could thus create a spellbook containing any of the spells the conjurer currently has memorized, since (PH p. 114):

If you lose your spellbook, you can [...] transcribe the spells that you have prepared into a new spellbook.

If the conjurer has one of their own spellbooks at hand to refer to, they could also duplicate any spells from that book.

Could you create the spellbook of a powerful wizard?

If the powerful wizard is you, then yes. :)

Otherwise, even with the powerful wizard's book in your possession, Minor Conjuration cannot not duplicate spells within it, since undeciphered spells cannot be transcribed.

What about the Keen Mind feat?

According to the accepted answer for "To What Extent Can The Keen Mind Feat Replace a Wizard's Spellbook?", Keen Mind would allow Minor Conjuration to duplicate one of the conjurer's spellbooks entirely from memory, provided they had read its entire contents within the last month.

If you're after a house rule which clarifies what you can and can't do with Minor Conjuration, I'd suggest following the example of the fabricate spell (PH p. 239 / SRD p. 140):

You also can’t use it to create items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor, unless you have proficiency with the type of artisan’s tools used to craft such objects.

So allow the conjurer to create anything they could otherwise have crafted for themselves, given time and nonmagical materials. Backgrounds providing tool proficiencies become an an important differentiator between one conjurer and the next.

Under the "if you could craft it, you can conjure it" house rule, the answers are as follows.

Could you create your own spellbook?

In short, yes -- as long as you could have conjured a blank spellbook to start with. While a blank spellbook would normally be an item that requires a high degree of craftsmanship, it doesn't actually need to be. It might be (PH p. 114):

[...] a loose collection of notes scrounged together after you lost your previous spellbook in a mishap.

All wizards can craft spellbook pages given just paper and ink, so no further tool proficiency is needed to craft "a loose collection of notes". If the conjurer happens to have relevant proficiencies (e.g. with calligraphy, forgery, or leatherworking tools) this merely allows conjuring a nicer spellbook.

Minor Conjuration could thus create a spellbook containing any of the spells the conjurer currently has memorized, since (PH p. 114):

If you lose your spellbook, you can [...] transcribe the spells that you have prepared into a new spellbook.

If the conjurer has one of her own spellbooks at hand to refer to, she could also duplicate any spells from that book.

Could you create the spellbook of a powerful wizard?

If the powerful wizard is you, then yes. :)

Otherwise, even with the powerful wizard's book in your possession, Minor Conjuration cannot duplicate spells within it, since undeciphered spells cannot be transcribed.

What about the Keen Mind feat?

According to the accepted answer for "To What Extent Can The Keen Mind Feat Replace a Wizard's Spellbook?", Keen Mind would allow Minor Conjuration to duplicate one of the conjurer's spellbooks entirely from memory, provided they had read its entire contents within the last month.

If you're after a house rule which clarifies what you can and can't do with Minor Conjuration, I'd suggest following the example of the fabricate spell (PH p. 239 / SRD p. 140):

You also can’t use it to create items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor, unless you have proficiency with the type of artisan’s tools used to craft such objects.

So allow the conjurer to create anything they could otherwise have crafted for themselves, given time and nonmagical materials. Backgrounds providing tool proficiencies become an an important differentiator between one conjurer and the next.

Under the "if you could craft it, you can conjure it" house rule, the answers are as follows.

Could you create your own spellbook?

This hinges on whether a blank spellbook counts as an item that requires a high degree of craftsmanship. The bar is actually not that high, since (PH p. 114):

It might be a plain, functional leather volume that you received as a gift from your master, a finely bound gilt-edged tome you found in an ancient library, or even a loose collection of notes scrounged together after you lost your previous spellbook in a mishap.

Every wizard can craft spellbook pages given just paper and ink, so they can certainly craft "a loose collection of notes" without the need for additional tool proficiencies. If the conjurer happens to have relevant proficiencies (e.g. with calligraphy, forgery, or leatherworking tools) this would allow conjuring a nicer spellbook.

Minor Conjuration could thus certainly create a spellbook containing any of the spells the conjurer currently has memorized, since (PH p. 114):

If you lose your spellbook, you can [...] transcribe the spells that you have prepared into a new spellbook.

If the conjurer has one of their own spellbooks at hand to refer to, they could also duplicate any spells from that book.

Could you create the spellbook of a powerful wizard?

Minor Conjuration could not duplicate spells from anyone else's book, since undeciphered spells cannot be transcribed.

What about the Keen Mind feat?

According to the accepted answer for "To What Extent Can The Keen Mind Feat Replace a Wizard's Spellbook?", Keen Mind would allow Minor Conjuration to duplicate one of the conjurer's spellbooks entirely from memory, provided they had read its entire contents within the last month.

If you're after a house rule which clarifies what you can and can't do with Minor Conjuration, I'd suggest following the example of the fabricate spell (PH p. 239 / SRD p. 140):

You also can’t use it to create items that ordinarily require a high degree of craftsmanship, such as jewelry, weapons, glass, or armor, unless you have proficiency with the type of artisan’s tools used to craft such objects.

So allow the conjurer to create anything they could otherwise have crafted for themselves, given time and nonmagical materials. Backgrounds providing tool proficiencies become an an important differentiator between one conjurer and the next.

Under the "if you could craft it, you can conjure it" house rule, the answers are as follows.

Could you create your own spellbook?

In short, yes -- as long as you could have conjured a blank spellbook to start with. While a blank spellbook would normally count as an item that requires a high degree of craftsmanship, it doesn't actually need to, since a spellbook might be (PH p. 114):

[...] a loose collection of notes scrounged together after you lost your previous spellbook in a mishap.

All wizards can craft spellbook pages given just paper and ink, so no further tool proficiency is needed to craft "a loose collection of notes". If the conjurer happens to have relevant proficiencies (e.g. with calligraphy, forgery, or leatherworking tools) this would merely allow conjuring a nicer spellbook.

Minor Conjuration could thus create a spellbook containing any of the spells the conjurer currently has memorized, since (PH p. 114):

If you lose your spellbook, you can [...] transcribe the spells that you have prepared into a new spellbook.

If the conjurer has one of their own spellbooks at hand to refer to, they could also duplicate any spells from that book.

Could you create the spellbook of a powerful wizard?

If the powerful wizard is you, then yes. :)

Otherwise, even with the powerful wizard's book in your possession, Minor Conjuration cannot not duplicate spells within it, since undeciphered spells cannot be transcribed.

What about the Keen Mind feat?

According to the accepted answer for "To What Extent Can The Keen Mind Feat Replace a Wizard's Spellbook?", Keen Mind would allow Minor Conjuration to duplicate one of the conjurer's spellbooks entirely from memory, provided they had read its entire contents within the last month.