There s pros and cons to either way and both are acceptable repairs.
How to replace roof skin.
You want to start off by melting all the lead out of the seams where the roof skin meets the top of the quarters and the a pillars.
This video is about 66 c10 roof swap video.
Follow the adhesive manufacturer s instruction for preparing the surface area.
If your trying to fix rust there s a good chance the inner construction will be rusty also.
Adhesive is used to help prevent rattling the front and back will be welded.
Attach a line on the exterior and pull it tight to the other end to assure alignment.
Thats how they replace a roof skin.
Strip the old skin off the camper down to the 2 by 4 inch studs.
In that case it be easier to cut at the pillars.
Use a little in front and rear to help adhere the skin to the structure.
Here is a video on how i went about replacing the roof on my 1971 chevelle.
Instruction repair video for automotive roof repair using pliogrip by valvoline.
1 piece aftermarket floor in rat rod c10.
How to replace a full floor in a vintage chevy truck.
Another alternative is to cut it at the pillars and replace everything.
Take care to not over heat and warp the skin.
To make it easier your can remove all the paint with a da sander and easily see where the seams are.
Use channel grip pliers to lock the skin to the roof structure and space them out approximately 2 feet apart all the way around the roof.
I know its a little fast but please feel free to pause to read i apologize.
Use a carpenter s level to ensure all studs are straight.