Room dimensions are just the first step in building the room, other issues include the construction materials themself, sound transmission factors, wiring etc. Before you start, may I suggest you do additonal research. A couple of books that will help are "High End Audio" by Robert Harley and "Sound stage studio construction on a budget" by F. Alton Everest ( he has other excellent books as well). If you research the archives here at A.Gon you will also find a wealth of info on the topic; see "listening room", "golden ratio", etc. There are a number of guys on Agon who can help as well.
Good luck,
jb
Good luck,
jb