Roof repair

[billye1982]

I have a 66 short wide with the worst roof skin I have ever seen but the floors are perfect, I also have a spare cab with a good roof, but horrible floors/rocker. I know the rocker/floor repair is a lot more common, but how hard is a roof skin repair? How is it attached, is it spot welded, or welded along the seam of the drip rails and such? The one with the bad roof looks similar to this all the way around, so it is not just this one section.