Best bet is to find a donor cab and use the roof, if your good with metal work, they are not that hard to fab, With an English wheel , you can pop out a replacement roof section, and a stretcher/shrinker you can do the fence and inner support panel.
A pillar....been a long time but I've used F-body(with some serious work) to graft in on a few trucks back in the 90s
With Time and effort you can save anything if you have the tools.

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Some of us are so open minded they only see their View