scrool down and you will see the finished front of the wall, and how the box is blue and atop the box is black then the balck roof. ,.,,,,.... that was done to seal off the top and same was done on the sides of the wall...
then further down you will see 2x4's going from the top of the box to the roof of the van to help brack and hold the box down. and then back filled with expandafoam... that was done to finish the seal off, but remember to properly lag/carrage bolt the box to the floor of the car last thing you want is to have it land on your neck in a accadent.
http://www.stevemeadedesigns.com/board/ind...=7757&st=40