Roof skin won't fit on trailer after rebuild...what now?

Hi, first post: rebuilt a mostly-rotten 1959 Cat-O-Lac DeVille canned ham trailer, similar to this:
http://www.tincantourists.com/classifie ... 3974&cat=3
Somehow it ended up too wide and the roof panels won't fit back on. The roof skin is supposed to overlap the sides by about 3/4" then be secured with J-rail and hex-head screws. The roof panels can overlap a tiny bit on each side with a lot of bending, cursing and general frustration, but the metal is getting pretty damaged in the process and I'm worrying about future leaks, especially here in the rainy Pacific Northwest.
So what are my options? Some other kind of moulding? New aluminum fabricated to work? Using what I've got and hoping for no leaks?
If you know or could recommend any sheet metal fabricators in WA, especially NW WA, it would be greatly appreciated!
http://www.tincantourists.com/classifie ... 3974&cat=3
Somehow it ended up too wide and the roof panels won't fit back on. The roof skin is supposed to overlap the sides by about 3/4" then be secured with J-rail and hex-head screws. The roof panels can overlap a tiny bit on each side with a lot of bending, cursing and general frustration, but the metal is getting pretty damaged in the process and I'm worrying about future leaks, especially here in the rainy Pacific Northwest.
So what are my options? Some other kind of moulding? New aluminum fabricated to work? Using what I've got and hoping for no leaks?
If you know or could recommend any sheet metal fabricators in WA, especially NW WA, it would be greatly appreciated!