I'm playing a Pathfinder campaign, playing a level 3 Magus (Soul Forger archetype) in a Open-World mostly Sandbox game. My plan is to make him a professional crafter. I've already bought Mastercraft Tools and a little workshop for him to work, sell and craft.
I have some questions about MasterWork weapons based on these rules:
To create a masterwork item, you create the masterwork component as if it were a separate item in addition to the standard item. The masterwork component has its own price (300 gp for a weapon or 150 gp for a suit of armor or a shield, see Equipment for the price of other masterwork tools) and a Craft DC of 20. Once both the standard component and the masterwork component are completed, the masterwork item is finished. The cost you pay for the masterwork component is one-third of the given amount, just as it is for the cost in raw materials.
Then, I think as a "roleplayer", can't someone come, with his own weapon, and ask me to make it "Masterwork"?
I can't find any resources about "Upgrade" weapons from crafting. The strange thing is, you can upgrade them by paying. By that I mean, if you have a normal weapon, you can make it masterwork/magic enhancement just paying the difference.
So, is there no way to "un-craft" your original weapon to "lower" the cost of making a new one? I am thinking about a way to "re-forge" it or get the raw materials of it. How can I do this?