A control room that small really won't do you any favours, especially with doors in corners hindering bass trappage capability.
Personally in the kind of situation I'd rather have an all-in-one tracking and mixing room. Having an isolated CR is a luxury in ideal circumstances, but to try and create one with such a tiny space will lead to more problems than it solves. The space is already pretty acoustically compromised by the very low ceiling.
Try http://sketchup.google.com/intl/de/The air hockey tables make the same sound my amps do and the singer likes to hop around when releasing the brootalz. I was lucky floorplanner.com had a drum set.