Windshield and rear glass question

Member "snakebit" has done the flush windshield on his Frankencuda. I think he had to trim the windshield down to fit properly (risky business) but he did chop his top. Of course my way is a lot less work and less risky??
Thanks,
Treblig
A lot is an understatement. I could see trimming the safety glass but that back window is tempered. I wonder how he did that. Slowly and keep it cool I'd guess.