Polycarbonate windows

The side glass is easy to make. Just buy sheets big enough for the individual pieces, take out the glass, trace an outline and cut it out. I did this for my driver side window before I found an actual replacement. The front and rear would be harder to make because of the compound curves, although with a thin enough piece you could just bolt it in place and it should form to the curves of the windshield frame.

If this is a street car you might want to check the legality of running lexan for a windshield, most states don't allow it.