Thanks for the post Brian. I have seen that model and thread before. It is a very simplified model of mk22 spitfire and only vaguely resembles the real thing. It is relatively easy for me to create a similar model.

There is however a huge difference between making it look like the real thing and vaguely resemble it. Making it look like the real thing is doing stuff that nurbs doesn't like to do unfortunetly.

Hope there is something in this thread for other users on their own projects.