get rid of everything that isn't necessary and/or functional. any little brackets, tabs, wiring at the very least lighten up the bumper brackets. if there's four of them do away with two, use one each side, fiberglass bumper. lexan in all windows, cut out window regulators, scrape out any sound deadening material. remember it's easier to find 100 places to take out 1 pound than finding 1 place to take out 100 pounds. first race car we had was a 1970 340/727/dana challenger and we got it down to 2680 without driver. this was lexan all round, fiberglass fenders, trunk deck and bumpers but steel doors and 10 point cage. what about fiberglass trunk deck?