Bullseye Builders specializes in studio construction and they do excellent work. They have built a number of rooms around Southern California, often working with designer/acoustician Chris Pelonis.
Click here for some good examples of their work:
http://www.google.com/search?hl=en&q...lonis+bullseye
The owner is Stuart Whitehair, main number is (818) 951-1988, e-mail is bullseyeb1 AT aol DOT com.
If you talk to Stuart, tell him Bradley referred you.
-Synth80s