lunaboy

Someone back in the day had to see the light and cut a sunroof hole in a 70 442, I want to fix this the right way and would like to know if anyone has any tips on this. Do you have to change the whole pnl to the top of the front windshield channnel or does front and back windshield need to come out to weld to the factory seems or whats the best way? Not sure i want to do a butt weld with overheat isssue and possible / warpage or just having to put to thick of a bondo skim coat.