Here is the information I found so far.
Everest recomneds the following ratios: Ceiling HT:Length:Width
1: 1.14: 1.39
1: 1.28: 1.54
1: 1.60: 2.333
1: 1:90: 1.40
1: 1.90: 1.30
1: 1.50: 2.10
These ratios are for the performing room of a recording studio and produce a fairly even distribution of the resulting room modes that would tend to reenforce specific frequencies in the reverbarent field.
As for the trapizoidal shape, taking the last example and using a Ceiling Height of 10' would give you a room 10' X 21' X 15'. This gives some coincidence of room modes so a litlle splaying would reduce the strength of the standing waves and spead the peaks of the modes. What I'm talking about is about 6" difference in length along the paralell sides of the trapazoid and 3" to 6" bulge for the curved back wall. Just enough to make a building ispector or carpenter cringe.
The two books I have found in our local library system are How to Build a Small Budget Recording Studio From Scratch...with 12 Tested Designs, Second Edition by F. Alto Everest and Mike Shea, ISBN 0-8306-2966-1, and The Mater Hand book of Acoustic, 3rd Editon by F. Alton Everest, ISBN 0-07-019897-7
The first book has a screening room as one of the tested design projects
The second book apears to still be in print and is avaiable from the publisher at
http://books.mcgraw-hill.com/cgi-bin...071360972.html
The vendor who has the program to select and place their reverb control panels is Acoustic Science Corporation at
http://acousticsciences.com. I checked their site and the have a section on Home Theater.
For ideas for the rack closet take a look at
http://www.silencecases.com.
If you can find a copy of Mix magazine they have a prety good cross section of adds from acoustic suppliers. Another mag to check out is HomeRecoding.
I hope this is of help
Grayson