The plan is to race the finished car (750mc regs) and there is a minimum weight for the car to be eligible. The concern is once the car is built if the car comes in light, I can add the extra weight with better roll cage, or larger fuel tank or better battery ie anything of benefit. If they come in heavy I need to cut back. What I can't find out is what weight a car built as per the book weighs.

Any suggestions?

"5.14 VEHICLE WEIGHT LIMIT: Minimum weight including driver is 615 kilos..."