As a student at IVY Tech Community Collage (Indiana), I have been
able to purchase with steep discounts the Ashlar Vellum CAD program
"Graphite",  Same program Burt Rutan has used for years.  Having had
it for only one day, I can say I have never experienced such fast,
intuitive drawing.  Graphite is a 2D/3D drawing program not a
modeling program.  It is available for both Windows and Mac.   Does
anybody else on this list use it?   Jerry