Lentz succeeded in getting linear measurements (including angles, which I would really like to be able to measure) from a CAD program, but he had to go through a lot of time-consuming steps to do it. I'm grateful for his efforts, as I have had zero time myself to seriously explore the issues involved in going from 3D back to 2D. Thanks, Ken, for all your work on this (and taking the time to explain what you did).