Need help designing box for 2 9512's for 4runner!!!

[DropDownLowYota]

I have 2 9512's that I need to design a new box for because my old one fell apart due to me dropping the box by accident, and it was off because I used the stupid RE box calculator so it was off anyways. I would like to use the torres calculator, but I wouldn't know how to make the box with subs up, port back. If anything it wouldn't matter if the subs are up with port back or subs and port back, whatever works well. This is for a 2001 4Runner and I want it tuned to 31. Dimensions are: 37.5x23x21. Need help please!!! OR IF ANYONE CAN DESIGN SOMETHING FOR ME IT WOULD BE APPRECIATED!!!

Here's what I need/am looking for my 2 9512's:
-Dimensions are 37.5x23x21
-Subs up, port back if possible
-Tuned to 31hz

[Moble Enclosurs]

PM me and I can can set you up in getting a design done if you like.