Need Help

[Audiobahnaholic]

Hey I know you guys here know your stuff and I know a little bit, but I need some expert advice. I am doing an install for a buddy who has a Jeep. I know that in a Jeep sub up port back would be optimal but I can't rightly figure out how to do it. He is running a Mach 5 Audio MAW15 off 800 watts RMS. His max dimensions are 50" wide x 20" high (window Line) x 26" deep. Can someone help me? Currently I have this designed but I'm not sure what it will sound like as the port is up:

4 cubes after displacements @ 33hz!!! NOTE: Has a dummy wall so it takes up the whole 50" width but has a 1.5" thick wall so it's only 4 cubes internal after displacements.

And I am sure you guys already know I need it loud and pretty low. I know this 15 is capable of it.

[Audiobahnaholic]

So Nobody with any skills on this spectacular site can help a guy with a design???