I make alot of machinery guards with 1/4" and 3/8" Lexan for work, and have made a couple of windshields out of the 3/8" Lexan but I switched back to a screen for same reasons eveyone else is telling you. The best way we have found at work to cut the Lexan is with a jig saw at very low speed. If you run the blade fast it will build heat and melt the Lexan, if you run the blade slow and steady you will get nice chips off of the blade and the cut will be very clean. I buff the cut down with a die grinder to make it nice and smooth, and then peel the protective sheet off of it and install.