Hi Michael,
Still having a blast with this program!
I had a suggestion about the "Show-Hide" function. Would it be possible to implement a way to show the "hidden"area that shows all of the objects hidden?
That way the user could pick what they want to un-hide and hit a "show" button and then toggle back to the "model"space.
This is a function that is currently used in the CATIA cad package and is extremely useful for complex models. This way you would not have to delete and profiles just in case you wanted to use them later.

I hope I'm making sense here. I'm not good at online descriptions.

Thanks!
Richard