Glass, Glass, Glass, did I mention Glass? LOL
After finding references for the metal man, do the same for the glass man before the job is started. I had a 68 Chevy PU that had been cut 4 ½ when I bought it. The glasswork had been completed but later on I cracked a vent window. The window was plain-jane flat laminated glass but I like to never found anyone to cut me one. Finding someone to cut a windshield could be a real hassle, especially if the person really has no experience and you keep paying for windshields until he gets one right.
Good Luck, me like chopped tops.