I had the same problem with my Allied body, It suppose to lay on & be attached to a OEM cobra chassis and glassed around the tubes. That's kinda tough to do so what i did was hand form aluminum jams, hood/doors/trunk/rockers and epoxied the aluminum to the glass body hammered /formed then riveted the aluminum to the birdcage chassis just like AC cars did on the original cobra. Kinda throws a curve at the people that checking a parked cobra for a riveted body. I'll get a few pics..
Mike