Yeah, guitar rooms should sound fine if you get them sounding like a lounge room. Due to how loud drums can be in a small space, that's the only reason I'd recommend dampening the fuck out of it. An electronic kit will fix that problem right away though and is a great alternative because the amount of sound proofing and dampening you'd need to do to control a live kit is VERY expensive. I still remember the day that the money changed hands to start work on this studio. It was no longer a "one day I'll do it" thing, it was a "fuck, it's really happening, now I gotta pay it back" thing. And honestly, it's a pretty huge stress because it's been hard to make it all work financially (mostly because of old projects that I needed to finish before the studio was put together that were hanging around causing problems, or LORD's touring/recording schedule), so be prepared for a lot of stress but a lot of rewards in many ways too.