well, yes if you are going to invite me to derail well I can hardly turn you down on that...
yes have a cnc but A) just got it and have a number of things to work out in the design yet and B ) I don't think you save yourself any time building just one guitar on cnc. I've easily spent more already on this build just designing it (again, I'm new to the cad/cam and mach3 but I've got power friends who are tutoring me here!) and C ) my goal is to use cnc to up my game more than crank things out so... admittedly pushing myself to things I might not have attempted otherwise.
when building by hand... once I'm actually building things go pretty fast but that's usually because of an awful lot of forethought... the only way I can keep myself out of trouble. I get the sense - only 4weeks or so in to cnc, that the amount of time I spend thinking ahead is about going to be doubled in the cnc design time and really the manual build time doesn't amount to much in contrast. It really is everything they say - not going to speed you up for one offs. That said... now I really feel like I have the ability to 'see' things before they are built. for instance, my current bass has got a radius top and a radius back... setting up a digital model allowed me to see that my ctrl cavity was going to be close on space... so I was able to modify my radius on top/bottom to give me a hair more room.