The 37 coupe WAS the lightest car manufactured. There are so many variables to weight its crazy. The chassis were not hard to figure out, the 37/40 coupe was the lightest, the 37/34 two bar sedan was next, the 34 coupe next and the 37 4 bar last. Fiberglass are all over the place in weight and thats a game changer. Add all the possible omponents to the mix and you have anybodies guess car to car.