Roger,
You don't really want to use plexiglas. It scratches very easily. I bought an 4 by 8 sheet of 1/4 inch Lexan MR10 a few years back. MR10 is specialy hardened to withstand scratches. The sheet was enough to made 4 windshields and a bunch of windwings. The windshield I installed on my car still looks perfect after 6 years and probably 50K miles on rally roads. I never touch it with anything but plastic cleaner spray and microfiber cloths. I sold the other three windshields on eBay for $200 each and got back my investment.
Shortly after I installed the windshield, it was hit right in the middle by a rock the size of a fist kicked up by a truck going the other way. I was doing about 70 and the rock hit with the sound of a rifle shot. I expected some damage but only found a 1/4 inch scratch. Great stuff!
I made my windwings about 3 inches wider than standard ones. They make a huge difference with wind buffeting. I also made a rear "windshield" for running in cold weather. This is great up to about 90 mph. Above 90, it tends to flap a make a little niose. It really keeps the cold wind off the back of your neck and ears.
RS
