Originally Posted by Joshua White

Always nice to see quality work in the sound department :-)

I too think a box hugging the rear seat is the best way to go, the only thing that could make your box better (imo) is adding a stepped face board to help protect the sub so when something is pushed up against the box it meets a flat area instead of the sub-surround and woofer as it moves, also gives you an easy way to mount a grill as you step the board up around the sub. In the end you might sacrifice a couple inches of space, but you'll protect your sub for as long as it lasts.