Help with a custom sub box

2001 Toyota Tacoma, single cab, bench seat.
Ok, so I want to build
A cust sub box for my truck, but I don't know how.
I'm looking for some help to make one.
Some schematics of a box would be great.
I want to put 2 sundown audio Sa 8s or 2 sa 10s if possible.
I want to build the box to spec of the subs so it will sound great.
The box will have to either fit over that hump in the middle of the cab,
Build around it.

 

http://www.rockfordfosgate.com/rftech/box_wizard.asp

Knock yourself out, remember to subtract the displacement of the sub woofer itself from your total volume.

 

It might be less of a headache to just buy a box. This one for instance. The guy that started this thread on sub boxes in regular cabs bought it. He said it barely works.

But it you want to build one, the outside dimensions for this box are 14-1/4" tall, 19" wide, 4-3/4" deep at the top, and 7-7/8" deep at the base. The sub mounting depth is 4-3/4." Using NorCalTRD's handy link (which I immediately bookmarked) there is 0.73 cubic feet on the inside using 1/2" MDF. With 5/8" MDF you'll get 0.68 cubic feet, and with 3/4" MDF you'll get 0.62 cubic feet.