Little help on a box please :)

[30Hz.wav]

Going crazy with torres calculator trying to get this box design right! If anyone can help, I would appreciate it!

So I am building a box for 1 12" Level 4 M2.

My max dimensions are

Width:26

Height:16

Length:16

Here is what I have so far, I know it's wrong, that's why I am trying to get some help. I can't get it tuned to 32HZ without messing up the volume and port area. I'm basing my port off the ports I found on sonic.

http://www.sonicelectronix.com/cat_m72_i664_xscorpion-box-ports.html

I'm trying to keep it to DC's specs of 1.5³ ft.

Thanks to anyone that can help.