I own a glass shop. I see no reason you (someone who knows how to cut glass) can't cut it (the windsheild) just like laminated flat glass. There 2 pieces on glass with plastic laminate. You have to cut both pieces with a glass cutter,run the cuts, use denatured alcohol to melt the plastic.
As for tempered glass, grinding or sandblasting my work but it's high risk at best, besides the heat problem tempered glass is tension form the tempering when you change the size it wants to blow up. But I won't say it can't be done. I've seen 1/8 or so ground off,but I've seen a lot blow up.
If you could make a flat piece work tempered or lami. it's easy. If you made a pattern for the door glass and took it to a glass shop and have them order you a piece of tempered 1/8 or maybe less you could bow it in the window would be hard to operate but it should work it won't be as nice as the real thing but you would have glass in it. one problem is it might have a flat spot in the center,another is getting the top front corner pulled in.Probably a $100 try.using lexan. it shouldn't be to hard to get the curve in itI Hope this help.
Good luck,
Randy HALL MIRROR INC. GLSHLE (glasshole)
I really like the chop.