A nice shoebox lid fit would be nice, but I think most have had similar issues? I posted similar problems in my rebuild thread. First, my floor ended up ~1/2" too high at the rear & the cap wouldn't set down. Trimmed the cap inner liner (the Salt doesn't have the same floor flange as the Sun) so it would set down. Then, I too had to wrestle the cap on the hull & my old rivet/screw holes wouldn't line up. I settled on a position where the most holes lined up & fastened the cap down. It was a two person job - one to hold the top and bottom in the correct position, one to run long screws in to suck the two pieces together. Once it was "tacked" in place with a few screws, I went back with alternating screws and rivets around the perimeter (like it was originally).