Thanks for your comments. That ax84 box looks good. The sound clip is pretty distorted, though, and I'm mostly a jazz guy these days. Does that make a difference in terms of cab design?
I came across this blueprint for a 1 x 12:
http://www.sound-design.ch/pdf/guitarbox.pdf
The instructions are in German, but it would be very easy to build. The box would be L19" x W14" x D10.5" How does that sound (no pun intended)?