cool... the rules today would make it cost prohibitiveImpressive. One of the guys I worked with designed an Indy car back in the early 80s for Sherman Armstrong Racing. One chassis was built in a small fab shop south of the Speedway. This was the era after tube frames and before carbon fiber.
The tub was constructed of fabricated aluminum bulkheads and sheet aluminum. It was not competitive with the March, Penske, and Wildcat chassis that were then dominant, so the car was never raced.
cool... the rules today would make it cost prohibitive