Replacing the glass and sunroof mechanism will save 40-50lbs (+/-, depending on the car), all up high. It was an easy weight-loss for our two Beetles that had sunroofs. I bought 2'x4' sheet aluminum and a cheap hand-riveter from Lowe's. I cut the aluminum about 1" outside the opening all the way around, filed the edge smooth, drilled the rivet holes in the car roof, about 2" apart all the way around, cleaned up, and put a good bead of silicone sealant all the way around. Then I drilled/riveted the aluminum from inside the car using the roof holes, starting in the middle - drill/rivet in front, then back; move one hole, front then back; move over to the other side of the starting rivet; front, then back, etc. Can easily be done in an evening, and hasn't leaked in 18 months for the first car, not in about 6 months for the "newer" second car. Should be easier than doing the rounded roof of the Beetle, too. It'll "boom" quite noticeably when you close the door, but never oil-cans while racing. A couple of layers of duct tape helps prevent interior condensation if in a humid climate like Alabama.
Half Fast Racing 2 New Beetles and a Miata
Class C win, MSR 2023; previously 2x 2nd in C, 3x 3rd in C.
I Got Screwed AND Halloween Meets Gasoline, Sebring 2024
Two Wrongs and a Right, NOLA 2021