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If you wanted to do something totally cool in Autocadd, create a parametric model of your neck. That way as you changed one or more parameters you could see how the effect rippled thru the neck. I spend a lot of time (by hand) trying to modify a neck that I like to fit a different nut width or scale length (sorry) or fretboard radius.

I was actually going to suggest something like that for your other thread but it was just getting too ugly. But think of this, if you changed your scale length what happens to all the other design parameters - does the sound hole move, do the braces move and in what fashion, obviously the bridge moves but how? It is the classic example of a parametric design, all we need is someone to do it.

Also, as far as your Autocadd work, you might be interested in several of the recent articles in American Lutherie talking about design of guitar shapes using circles, tangents, splines, some of the classic ratios (Golden et al). The authors typically give both manual and computer aided drafting methods. As I recall the OM was one of the shapes they came up with and this could easily be made into a parametric model too.

just go with what feels good. Once the thickness and width are established, profile the neck to suit your personal preference. Is this correct?