ever heard of the 60's fiberglass car, the LaDawri? Think Paxton Supercharged Cobra GT 350 with a different body, because it's 289 in on a Ford chassis... thank you George and Doug!

Dawes began producing fiberglass bodies in British Columbia in 1956, introducing the LaDawri Cavalier – widely considered Canada’s first production fiberglass sports car. After moving operations to Southern California in 1957, he expanded the lineup to include around 19 models, reportedly selling about 700 bodies before the company’s closure in 1965.

So, that's just seeing what was going on, the fiberglass Corvette, but dying with the 1965 GT 350 Cobra Mustang's availability

https://silodrome.com/ladawri-conquest-car/

and it's currently on Bring a Trailer for 20k! https://bringatrailer.com/listing/1962-ladawri-conquest/

There sure were a lot of choices for anyone that wanted a Fiberglass sports car, Meyers Manx, Fiberfab, Glasspar, Victress, Devin, Kurtis Kraft, Kellison, Bocar, AMT etc