Welcome!
Yes, cut away models stopped being produced a long time ago.
Timmy shows what I consider the class of the lot, great build.
It's always possible to make one up, but it does involve a lot of work.
Some aircraft kits have been put out, back when with the Monogram B-17 and more recently by I think Tamiya, where theres a clear side piece.
As for the colored edges, it's ones own personal taste. I suppose the practice goes back to how museum display builders showed the obvious fact that the visible edge didn't really exist.
Coming back into the hobby, have a open mind. It is more or less an ENTIRELY different thing than it was 50 years ago.
Just search online for a narrow subject like "cut away car models" and you'll probably be up all night reading.