That's not that bad for rust in the body, mine was ten times worse. From the few pics that looks very restorable, I don't think it needs a re-body. Sunroof isn't too big of a deal to fill in but those side windows are huge, I'd be using the WB shell as a donor for the side panels and other rust repairs. At least it is still in original paint so shouldn't be too much hiding from you.

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