well, I finished this weeks ago but I am just now getting around to posting pics of it.
I used a little ED (elemental designs) 8" sub, powered off a profile 350w mono amp. Internal volume is .36 ft^2 sealed. I wish I was better at fiberglass, as it would have been easier to build than cutting about 15 different angled prices of mdf. Anyway, it actually sounds pretty damn good, plays about as the wife needs it to, and leaves full use of the hatch/trunk area and spare tire access. Just thought I would share for anyone else that might want to build something similar.