When I was a new paint guy at a parts store in Idaho,the old paint guy told me that you could cut a windshield with a sandblaster. They would tape most of the glass up,then stick inner tube right up against the marked line(with 3M spray adhesive)on both sides. the sand would cut work thru the glass,but bounce off the rubber. once they got to the plastic laminate they just cut it with a razor blade. I 've never tried it, but a glass guy I know thought it sounded brilliant. has anyone else ever seen this done?