Can a simulacrum with the cooperative crafting feat participate in crafting magic items ?
Do Crafting Mastery and Cooperative Crafting stack ?
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1) Yes, as long as the simulacra also has the relevant item creation feat.
2) If you're talking about the doubled time benefit, I think so but remember that the stacking rule is two doublings = one tripling, not quadrupling. Crafting Mastery should also allow you to bypass the "must have item creation feat" requirement on cooperative crafting, but in that case you don't get the extra speed doubling.