Would somebody help me design a box?

[Winn]

Trying to design a box for my lvl 3 15s. Confusing cause the whole Cargo area that i want to use is like 12 cubes.

I want it done properly i guess

The dimensions are 20 height x 35 depth x 40 width

i want the right amount of port area and the correct box designs. so i want subs up port back. and I want them inverted based on if i like the design or not If you have any ideas throw some up in torres calc. I also want it tuned around 33 to 36 hz