*snicker*
From reading your last post, you're closer to my own position than I'd thought... coming from a single-room studio to a larger space, AND you need a spot to tuck your band away inside.
This explains perfectly why you wanted the tracking room to be so large. You don't want to move your own band's gear around every time you get a client in there.
This also explains the difference between the main tracking room and the other iso booth.
I have been playing with design ideas to get around this problem for a while. There's a couple solutions I've come to, but I'm still working out which one I'll use.
a) 2 tracking rooms- one big enough for a whole band (yours, for example) and one big enough to track drums. In this case, a client band would put the drummer in the drum room and everyone else in the control room, possibly with amps in iso or playing direct thru DI boxes or PODs (these are a wonderful thing to have for laying scratch tracks, even if you never use them for real tracking). If you go this route, I'd scratch one of the Iso booths to make more room- you'll need it to keep from having a tiny control room.
b) 1 tracking room big enough to hold your band AND a client band without having to move everything around. This is one of my favored concepts, just because it means the tracking room will be the biggest, which will make it the best-sounding and easiest to treat for acoustics. Depending on your layout, you may again need to sacrifice an iso booth.
c) The tracking room big enough for the client band, and the control room super-oversized- because control would double as your band's practice room. This is another good one to me, because now the control room has to be big- and again, a bigger room will sound better and be easier to treat. This will make your mixing a little easier because of the big room (many studios have a bigger control room than tracking room for this reason). The only big drawback I'm running into here is with laying out stuff in the control room itself- it's easiest to put my band's drums in the back of the control room, but that means the drums are right next to the most absorptive wall in the room. If I want to track drums where they stand, I'll need to build some reversible panels into the back wall to make the room more live. This isn't a big deal, really. But in this configuration, multiple iso booths will help you out a little- and the main tracking room for clients can be relatively small. The drums would go in there, while the rest of the client band stand in control, with amp(s) in iso.
I know this sounds like I'm making mountains out of molehills, but it's the kind of thing you should think about when doing the layout so you don't get stuck with an impossible problem later on. It really sucks telling my guys that they gotta break everything down once a week to make room for a client- especially when the keyboards take up just as much floor space as the drums.
Spend some time thinking about it. Your choice of configuration will depend greatly upon how you prefer to work.
Kase
www.minemusic.net