I'm trying to answer your question.
I don't think it was a neck seal from a dry wet suit. Something similar, inspired from it. Neck seals a VERY tight, those in the pics look rather loose.
1) It could be be seam line, but also a reflection. Not sure about that. If it is a seam line, it will make my life a lot easier. What to common opinion about it?
2) I think those differences is because the ribs are crunched (becaue they flexible)
3) there are def, different sizes
4) all neck seals were "slashed" to better contour the body, shoulder.
Any, Jack, many thanks for your input! This might help mget my lazy an impolite person off the chair.
Unfortunately, my flat is about to get renovated. Getting a new kitchen, bathroom and balcony.
My workshop (kitchen) already emptied, I only have a small place left to cast hand guards.
It might take 2-3 weeks until I can finish the prototype.
In the meantime, let's do some research again.
Any help is aprreciated!
Karin