I just want to thank everyone for the useful feedback you guys are a great resource and definitely keep me occupied during slow moments at work.

The box is in a Saab Convertible. The trunk is REALLY small (compared to the Contours) and I built the box as large as I could to still allow room for golf clubs, beer, etc.

Specifically, the box fits tight between the wheel wells, and just under the roofs storage compartment. Its approximate demensions are 7"deep, 13"high, 36-40"wide

Below is a crude top view of the box. Please disregard the periods. They represent empty space. As the box goes back, it becomes less wide to accomodate the roofs motors.

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This end faces the tailgate and is where the woofers are mounted.