...Raising the dead is believed to be possible in Amestris, but it's illegal, and for damn good reason. Human transmutation is supposedly impossible without bypassing Equivalent Exchange - even if you had everything to physically make up a human body, how do you make a soul?

[...it's something he's thought a bit about, um.]

Anyway, I think it might be possible even in my world, so in worlds with access to magic and stuff like that... yeah. It seems pretty doable.