I've often thought that a proven jig like this can also be used to build a new body out of replacement panels too. Sounds like a great idea.
Do yourself a favor though and don't make the same mistake I did. When aligning fenders during the bodywork phase, don't just use one or two bolts on the ends and call it a fit. use bolts at ALL locations to fit a fender.
I had the hardest time aligning mine due to this. Even after installing with the two or three bolts tightened down, all the others started pulling things in directions I didn't see coming.
1966 GT Fastback, restoration almost there! Code T Red with White LeMans stripes.
2015 GT Fastback - Deep Impact Blue