Help designing a enclosure for my 15 Q

[Jacob86 0]

I'm looking to build a new box for my blazer. I listen to mostly rock/metal but I do like rap. From what I've read 4 cubed and 30hz. If someone thinks differently i'm open to suggestions.

My max dims are 37.5 wheel well to wheel well, 32 from the top of the rear seat to the tailgate, floor to top of seat is 15.

I'm planning on putting in a false floor and I don't want to block my rear window so short is good.

I'm running a hifonics brutus 1208D if that matters

Thanks for any help