This is my first post here and I've read, with interest, your detailed Frolic rebuilt.
GOOD INFORMATION ABOUT METAL SIDING . . .
Folks that need original type aluminum siding, mouldings and trim parts (plus underlayerment, etc.) need to check out this site, and their online catalog(s):
You'll find what you need to finish this baby at this site!
I plan on reskinning my nice '67 Frolic pretty soon . . . and it looks like they can duplicate my siding perfectly!
CHECK OUT THEIR CATALOG FOR "CORRUGATION PATTERNS"!!!
Good luck on your project and keep us posted with lots of photos!