Above windshield rust

[Roadkillerv8]

Hey fellas, i picked up this '72 Sierra in Feb this year and i plan on getting the whole thing redone sometime soon. That is all the rust and repainted, it was originally that kind of mustard yellow, then it was red, and i bought it when it was blue haha. Anyhow, you can see the rust im talking about on the top of the windshield which is probably the worst rust on the outside of the truck. Above the drivers door theres a pretty good spot that you could probably poke your finger through if you tried hard enough, but thats the worst of it. Would it benefit me more to just have that all cut out and redone or just have a new roof welded on?
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