Hi Mark,
The wrinkles that I noticed are circled in red.
As far as I knew, the saucer section was called the primary hull, and the lower section with the shuttle bay was called the secondary hull. I could be wrong though. From what I read when I was a kid, the Enterprise was built in parts, those parts lifted into orbit, than assembled. Pretty much like the International Space Station. From what I've been able to figure out, the Enterprise in the new movie is build on Earth, then lifted into orbit. Again, I could be totally wrong on that too. The mind starts losing and confusing facts as one gets older....
Anyway, it is really a great looking model.
Al