Hey bilnddrew. Good luck on you "adventure"!
Just curious, are you pouring a slab and framing from the ground up? Going pre-fab? Transportable?

I've built a couple of in-home studios and happy to share what I learnt along the way when you get to that stage.
I would have loved to have done a self-contained outbuilding like you, but circumstances didn't allow it.

What sucks is we eventually ended up selling both of those properties, so now I'm "studio-less". I'm jealous!