Need Help with Vinyl Roof Disease on '72 Scamp

Unfortunately, life intervened and I have not been able to replace the roof yet. I started cutting into it and discovered that, as others suggested would be the case, the rot did indeed affect enough of the frames that I'll have to replace the entire roof. Moreover, it turned out my friend couldn't help as much as he had intended. So I decided to patch the roof temporarily (with liberal use of fiberglass cloth) until I can either get a new body or time to tackle the whole project by myself.

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As you can see, it's not that straight, but I don't really care about having a job that looks professional when the roof is in the shape it is underneath. Also, I'm thinking that if I can get subframe connectors welded in, that should make up for the lack of support from the roof.