I agree with Danno. I use 18 x 24" (1" squares, 4 to an Inch) Grid Paper under 18 x 24" draftsmans vellum. That, along with my trusty scale ruler, T-Square, Traingle, circle templates, ect, ect, and my drawing board. I learned basic mechanical drafting in high school, crica 1980, so besides being a cranky old foul dude, I don't have the temperment, or time, to learn a computer program. Also, I like being able to use actual REAL guitar parts (mounting rings, bridge plates, ect.) as templates on my drawings. This allows me to be sure things are where they are suppossed to be and how I want them to look. Another plus is, I can cut out any body or headstock shape , and tape it to a REAL guitar and get a sense for playablity and astetics. Oh, and you can take a REAL body, lay it right on your paper (coping neck pockets, center point ofo intonation, any routings, ect.) and simply make changes to an already proved and working guitar model, rather than try to re-invent the wheel. All items you need are available at any good art supply house, or even your local Staples has a "drafting supplies" isle. Hope this helps. Jimmy K.