rockford t1 15 box

Hello All!  I'm in need of some help for an enlosure I'm going to be building this weekend.  It's going into a 2006 Hummer H3, and is for (2) Rockford Fosgate T1 15" Dual 4ohm subwoofers.  I'm constrained to 37" wide, 20" deep, and 18" tall.  I'd like the subwoofers firing toward the roof and the slot port wherever it can go.  I'm thinking on the same side as the woofers to keep the port in phase with the woofers.  I'm planning on doubling up 3/4" mdf on all sides and using resin on the interior of the box.  The manual for the subwoofers says they need 2.75 cu.ft. each, and (2) 4" x16" round ports.  I want to use either a single chamber for both subs and a single slot port, or a separate chamber for each sub and 2 slot ports.  Does the port area seem a bit small to anyone else?  Does anybody have any experience with these subwoofers that can sort of lead me in the right direction?  Any help would be AWESOME!  Thanks!

Jason @ AudioMan

anybody...anybody?

Jason @ AudioMan