Everyone,
Thanks for the feedback.
I did have the entire cab blasted inside and out so I asssume what is left is thin but solid. Sounds like this is common on the 39 - 46 style cab.
I guess I'll try to figure out how weak the area is before I go forward. They painted the cab after blasting with epoxy primer. So no mater what method I use I will have to get the paint back off. I like the idea of plugging the holes some how, but worry about how much grinding the metal will support. If it doesn't look good I will use the body filler method.
Is Metal-to-Metal a brand name or a type of body filler?
Bill Schickling