I admire your efforts for keeping the original cab. I’ve done a lot of cabs, anymore I decide before I start on one if it’s worth my time or not. If not, I just buy a new one. Once you start replacing entire sections, the originality is gone. You can get so many hours tied up in just the cab and in the end it’s not as structurally sound as a new one. Here’s some pics from one of the IJs I replaced the bottom in a few years ago. I split the cab apart to do it so I could keep the factory edge along the bottom of the cab.
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I would say your cab is in no way inferior or going to separate. All I’m saying is there is a huge time savings and a better cab in the end. New cabs are CNCd, no contamination, no separated plys, tighter joints, and more than likely better materials.

I restore original cabs too, sometimes it makes more sense to go with a new one in my opinion. You look like you are doing a great job!