I'll try to take some more detailed pics soon. Because I removed the foam pad from under the carpet (to give room for the amp) I'm looking for some boat engine-room insulation to mount under the floor for some heat insulation. I found some roofing patch material that's like tar that might work if I can't find anything else. They claim that nothing short of a blow torch can remove it, and the VW bus guys use it as insulation, so that might be what I'll use.

-Tad