Need help with box design 2 SP4 18s

[Brandon McCullough 0]

Going in a 99 Yukon Denali...more of a musical setup. Ive only built one box prior to this one and wanna do this one right....any input would be appreciated!

 

Max dimensions are

 

48" from back seat to back doors and 48" wide between wheel wells

 

Window level is 20"

 

Backseats are 22"

 

I was shooting for something thats not too crazy high above my window line but I'm open for any and all enclosure designs here.