Hello all! I (somewhat unfortunately I suppose) only have 15 1/2 feet of depth for a HT-only room I'm about to build in my basement. I can pretty much make it any width up to 15 feet. Basically, I have a square to work with, but I know that a square isn't the best shape. I'm thinking about making it 12 1/2 feet wide. Does that sound about right? Height will be appx 7 1/2 feet, except where duct work runs down the middle at appx. 6'8. I'll be posting my "before" pictures as soon as they are developed (no, no digital camera just yet!!), and then documenting my progress as so many of you have!