Replacing the roof will be a lot cheaper AND FASTER an to me a lot better than cobbling parts to a rusty roof.. Take out the glass an make 4 cuts.. weld it up and your done.
All new sheet metal. The mig welder got a work out. You barely hit the car sheet metal with the welder it will blow a hole. I did have to resort to a small amount of filler to get the body line perfect. Even though its under the trim. I wanted a all steel car. I don't like body fillers.