I had a 69 Valiant done last year. A shop who I know the owner well for a couple decades. We took the old one out and prepped the roof. They had the glass taken out- which is an issue because no one wants to do it in case it cracks. I believe the glass guy walked after he had trouble getting it back together. The shop finished it up and it came out really nice. It was supposed to take a week- took two weeks!