I've tried section planes, a tad. Seem cumbersome, for sketchup, particularly when I want to take a section of something in the middle of my model. Sometimes I seem to able to section from front and back, but at other times it doesn't seem to work. If that's what you do, I'll keep working with that tool some more. I'll also try the 2D. Thanks for your input.
As an aside, I am working on a model that I wanted to be able to see the views through the windows. Imported pictures of the site, made them 1000 feet wide, and hung them up a few hundred feet from my house, like big pictures. Worked like a charm.
