Check out the top on this 78 targa, claims never to have been removed or folded (!!!)
The vinyl front and back fit way, way better than that of my recently-rebuilt-professionally top. I guess that's what we're going for. I have worked on mine for the better part of 3 years and still haven't been able to get mine to be as good as this (apparently factory) fit.
https://www.youtube.com/watch?v=QRH_4tD4fcw&t=484s