I think that half the battle with acoustic treatment of a room can be won by choosing a room where the walls aren't parallel to each other, doing so will go some way towards reducing acoustic reflections that cause standing-waves, you shouldn't have to use a whole lot of acoustic dampening foam to deaden a room, a few foam tiles in strategic places should be enough, a good test of a room's acoustics is to stand roughly in the Centre, or where the Digital Audio Workstation will be set up, clap your hands and then listen and analyze the tonal quality of the room, does it sound reverberant (live) or not (dead), are there any ringing tones (these could be caused by piping hidden in walls)?, then gradually add the foam acoustic damping in strategic places till the reverberation and ringing goes away.