FG Enclosure in a '94 Z28 hatch

Hey guys, I am getting started on a FG enclosure for a friends 1994 Chevy Camaro Z28 w/ the T-Top racks. the racks have already been removed so all we have now are those long bolts that hold the racks in place. my plan is to mask off the cargo area and lay resin down to get the form i want, in order to flow along with the OE rear cargo paneling. we hope to mount 2 Kicker L7 12 back there with a properly tuned port for extra "BOOM" as it were. my bigger concerns are...how do i get the resin/fleece form to release from the masked off car...anyone have any ideas for incorporating a set of amp racks into this MASSIVE enblosure...and aside from bracing and using FG matte, is there any other way for re-enforcement of the enclosure??? any ideas would be greatly appreciated. Jeff

You should put a picture up of what you're talking about. I'm not terribly familiar with the interrior of those.