Fiberglass sports cars are nothing new, but the availability of build it yourself brand new fiberglass bodies might be. You can now buy a 1955 Byers SR 100 in various levels of completeness, for various levels of money

the cost to complete the car will depend on how much work you do yourself and how 
elaborate you want to get with the build. Starts at 10k

https://autoweek.com/article/diy/beautiful-byers-sr-100-returns-production-modern-twist
https://www.hemmings.com/blog/2018/02/20/worlds-most-beautiful-sports-car-production-resumes-after-50-years-with-first-new-byers-body/