As for Lexan, that thought crossed my mind, but Lexan isn't DOT-approved for use on windshields. DOT and state regulations require the use of laminated safety glass for the windshield, though using Lexan for the side and rear glass is a very viable option. Of course, that's not saying I couldn't use it for the windshield, but I could run into problems with it if someone with a badge has a good eye.
Lexan is used in aircraft and choptops that were not done properly...like mine. It's actually very inexpensive though...I could get a sheet large enough to do the windshield for about $200 from Jegs...but it would still need to be formed, which would be a tricky proposition. I ran into this thread over at HotRodders.com where someone was describing how to do this:
Of course, I don't happen to have access to an oven large enough for a windshield, so I don't know...I've got some time, so I'll just keep researching and see what turns up.Make the first template out of 1/8" tempered Masonite and cut it a little larger than needed and use a disc grinder to fit it close and then file fit or use 80 grit paper to final finish. Use small ribs made from plywood, glued and brad nailed to the Masonite on the inside of the curve to complete the shape. Lay your Lexan over the Masonite allowing 1/8 of an inch overlap on all sides. Put 1/4" carriage bolts with large washers in the bottom and bend the Lexan over your 'buck' and use large paper clamps (with taped edges, so as not to mar the Lexan) along the top and sides. Pre-heat your oven to about 350 degrees and pop it in, taking care as not to touch the hot metal surfaces inside. Heat it up for 10 to 15 minutes, turn off oven, open door and let cool for 1/2 hour. Remove from oven, CAREFULLY remove clamps and allow Lexan to relax until it is at room temperature. Remove bolts from buck and see if it retains its desired shape. Trial and error on the time, but don't go over 350. Keep the rack of the oven in the middle....