I have a '68 Coupe in my driveway waiting for it's turn when my Camaro is done.
I think it sort of a catch 22.. people build first gens because there is a ton of aftermarket support for them.. there is a ton of aftermarket support for them because people build them.
It's the chicken and the egg deal.
I think Mustangs are great platforms and if you don't HAVE to have a fastback you can still get them for a great price.
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"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones:
https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS