I'm currently building a Mastigos mage and I wanted to get a good grasp on how the Mage Armor attainments work.
The Mind and Space Mage Armors both say (on page 194) to add the Arcanum's dot rating to your Defense (so, with Mind 3 and Space 2, I'd get +3 and +2 Defense, respectively). In Space Armor's description, it also mentions that you add your Space to your dice pool when Dodging while Mind does not, even though Mind also addresses Dodging.
My point of confusion is whether the bonus to Defense from Mage Armor is used when doubling Defense for your Dodge dice pool.
I would imagine so, due to Mage Armor adding to your Defense score before it's doubled, which would mean that Space armor adds your Arcanum bonus to Dodge rolls three times (+X bonus to Defense, multiplied by two, +X to Dodge), which is quite helpful. If not, then that makes the Mind Arcanum's Mana-expenditure ability riskier.