thanks for the insights, Mr. Dorsey.

the two most important functions of the iso booth will be to record
vocals and to record a cranked 4x12 guitar cabinet.

would getting some of these RPG "modex corners" actually help?

http://www.rpginc.com/products/modexcorner/index.htm

i could almost see myself raising up the guitar cabinet and then
"surrounding" the perimeter of the guitar cab with these modex things.