"AutoCad? No, I don't, but if this is the one that will help with designing proper ribs for a tepered wings, then I might have to get it. Thank you. "

From a LOOOOONG time AutoCAD user. Do not waste your time. AutoCAD was originally designed as an architect tool, and is/was not easily adaptable to airplane drawing. There are too many purpose designed programs, that are less expensive, and much more user friendly out there.

I seem to remember something like Profili, or something like that, had a free version, that would do enough.

Les