box help

[lolitskasey]

So i am trying to design a box for my subs 2 12 level 6 looking for some input on what would be best. I was thinking subs up port back looking for around 1.5 cubes per sub tuned around 32 hz. having a head ache trying to figure out this my max spec are

D: 25.5"

H: 22"

W: 39.5"