It'd be interesting to add up all the drilled/lighter weight parts vs the undrilled heavier parts.
When I crewed/fabricated for a Winston West team back '93, we were also anal as all getout about weight so we could ADD lead exactly WHERE we needed it, down low and on the left side fore and/or aft. In NASCAR we had a minimum weight to meet and that was actually pretty heavy compared to drag racing. A lot of that weight was in steel tubing for the cage system which is high/top weight.