Some one wanna throw a rough design together?

[Hitler]

I need a design, nothing fancy just something to work with. Its for 6 12" type R's and max dimensions are 41w X 30d X 22H. Tuned low, 30ish hz. Im gonna try and put one together right now on sketchup.

[IDSkoT]

39.5x28.5x20.5 = 23077.875/1728 = 13.35 cubes.

What's recommended size per sub?

I'll definitely make you a sketchup of it, if you want.