[infraredcalvin]

Right on, you've done some homework! As far as the Sheetrock, You could be right about the it being done at once. If the builder "intended" to offer the studio as potentially separate unit for marketing purposes, wink wink, then there would be a one hour separation from that floor to the next (ie, the 5/8 layer of rock), but it's the occupancy (as defined by the building code) that matters I have built and sold a lot of condos/towns in CA, so I've been there.

Keep the updates coming, I like your quest for more garage. Dont forget to prewire for speakers, computer/ tv, nice to have the game/music on or search pelican diagrams when you get stuck!