I didn't do the windsheild in Lexan.All the other windows were 1/8" (except the vents 1/4"). I ended up screwing a piece of 1/2" x.100" aluminum angle to the bottom of the side windows to keep them straight. The back light is 1/8" mounted in the stock rubber. My wife got me a roll of the paper they put on the tables in doctor exam rooms. I taped it to the O.E. glass and cut a template. Looks like glass. I agree I wouldn't have tried it on the windshield.
Doug