as gay as it sounds im only useing 2 15's in a wall. i know usually people do 4 maybe even 3, but i wanted to try it out first... anyways, i want it to be a removeable wall. so basically a big box in the back seats... i drive a 1993 subaru impreza wagon. its like a long civic hatchback. it shouldnt be hard to get the box in there .. but how would i seal the edges off? would i have to mount the box itself to the floor then make somthing like a beauty panel(s)??? or could i even just take 2x4's and wedge them at the top and sides of the box until its tight and then use foam??? or both ideas would work best im sure.. how would you go about it?