[dremd]

I know a guy that used to make windshields for motorcycles out of plexi (a certain type worked best).
He would hear the sheets of plexi in an oven that was set to a temp that would make it about as floppy as wet noodle, then draped over a form that was wooden and covered in velvet. Later the edges would be trimmed, sanded, and hardware attached.

There is a windshield film that you will want to look in to, it is crazy durable, but has a life of about 3 years, and is fairly pricey, that said, cheaper than a custom compound curved piece of glass.

Not sure on legality of plexi on cars, my family had a van when I was a kid(86 model) with plexi side windows, they got hazy at the top with what looked like spider cracks (never failed)after about 10 years, but it lived outside in the south, and the windows outlasted the paint by a long shot.