alittle advice

[mtdewelf]

12cubes net in here, box 72"wide, 15"tall, 32" deep. Back up against BACK of trunk with ~2' clearance from rear seats, subs are gonna up fire, wondering if conventional back firing port would be better then front fire in this case.
pic for clarification, I suppose.
http://i63.photobucket.com/albums/h154/mtdewelf/IMG_0210.jpg

[mtdewelf]

I can make the box "odd" shaped so that it is the 72" wide, but narrows to squeeze between wheels, having aero's firing through rear deck even. someone willing to help out with the aero idea. Willing to paypal by all means if someone wants to discuss and plan the aero's with me.