The main goal here is to deaden the room to as close to a completely anechoic state as I can achieve. Any reverb that goes into the mix I want to add electronically.

Early on in the thread I posted pictures and in those pictures you can see one wall with completely ripped up drywall. The other side is a neat cut. That "other" side is where the drummers go and THAT side can bounce all it wants. I like some natural echo on drums, though there will be some damping over there too for the same reason, that reason being I want to add reverb with the digital reverbs.

I also have a bathroom up there so singers can go in there for isolation. (And it gives me a reason to clean it.)

There is a lot to be done, like running headphone jacks into various rooms, etc.... I have a 4 outlet headphone amp and easy access behind the walls so that won't be difficult, just time and money consuming to make long cables. The drum room has an 8 channel snake coming through the wall for drum mics. I probably SHOULD just run speakers over there for monitors since I have a spare power amp and 2 Yamaha speakers from my live days. But first things first. Windows in the walls, then wiring run, then lighting, then paint, then wall treatment.