Not for most of it. Surfcam, Mastercam...any other real reputable cad/cam software that will mill anything complex like archtops etc... all come with hardware keys...ex) HASP (key that plugs into the parallel port) for mastercam, etc...
Cheers,
Nish
My Mastercam sales rep told me that version 9 was hacked and on the internet before CNC Software had even released it to the public for sale. If you want it and you know where to look it can be had.
Even once you have the software, there is the learning curve. It took me forever to create my LP surfaces, and I work with this stuff daily.
As far as a homebuilt cnc machine goes, I would think you would be looking at spending serveral thousand dollars to build something heavy duty enough for most guitar work.