That would be something else if all the custom parts could be put back in - although the one-piece glass unit for the chopped top conversion would be a REAL surprise to see... Model Empire's sale last year had a bunch of the front and rear ends and I've been kicking myself for not grabbing a few.
Don't give up just yet - it takes practice and the proper tools but it can be done. A scribing tool will get the line started, and the back edge of an X-acto blade will continue it to the correct width and depth. Use a metal straightedge and go lightly and slowly, and of course practice on scrap plastic first. The door on a 2-door Nova should be a hair under 2" long at the widest point - measured horizontally along the body crease (I just now checked this on my '65 Nova hardtop which is the same body as the '63). Yours may be a bit shorter because of where the roof was installed. Here's a quick photoshop of how it could look:
Wow. I'd save those cool "STOP" flashers above the windshield of that school bus if the lenses are OK. Too bad the FC Jeeps are all eaten up. Mark, are you a member of the H.A.M.B.? I'd like to post a couple of those to their "Sitting and Rotting" thread with your permission.
Friday evening I was VERY surprised to see a sharp-looking replica of the American Graffiti '32 Ford heading north on Waukegan Road in Glenview crossing Lake Avenue; no time for a photo but it looked very accurate.