Hi airdog - that gives me a lot better idea. I'll see if I can come up with a couple of examples for some different approaches.

One method might be to draw some curves and then build your model by sweeping along those curves to build things up in strips.

Or if you want to have one single surface and trim holes in that, you will probably make a closed profile in the elevation/front view, and then use that as the cutting object to trim, instead of trying to have trimming lines placed in the top view.

- Michael