Box help?

Ok i need some advanced help. Im building a new box for my 1993 isuzu rodeo. Its going to fit 4 lanzar max 12" single voice coil subs. I need somebody who can give me close to perfect dimensions to sound good. My Maximum size measurements to work with in the cargo area are 39 1/2" x 29" wide and 18" inches deep. I want to have all 4 facing up. I Also would like to build a ported box this time. I have a sealed box right now but the dimemsions are all wrong and its sealed. btw im powering them with linear 3200d amp. Heres a link to the specs for the speakers.
http://lanzar.com/manuals/MAX8-10-12-10D-12D-15D.pdf
I really appritiate it.

Right now my box is 1.3 cubes per chamber. sealed. And it sounds like shit. I want something that hits hard and low.

ngsm designs stuff, and i think bumpin stang does, but i havent see nthem around in a while

I just need to know the interior dementions and port size of each chamber. I can figure out how to fit it. I just need to know whats gonna sound good. based upon spec.

download a program called winisd

is there anything like winISD that can handle boxeswith ports larger then .140 meter x .140 meter ?

Will winisd deal with an enclosure that big? for my app.?

it will deal with stuff pretty bug, but im looking @ 10CUFT with 140SQIN port area, it cant take something that large, so im back to basic math :(