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Cnc is expensive...
me and a buddy of mine gave a guitar business a semiserious go a while back...
look into a router pantograph... it lets you trace a pattern with a point, that directs a router to cut the same pattern out of wood... instead of needing an digital pattern for the guitar you would need a wooden model instead... if your serious about starting up I'd try going this route and buying the hardware in the meantime... try winding your own pickups... after you get a few sales in and can see the reality of whether or not it's possible to succeed in this business then you could look into going full out Cnc...
a router pantograph would be somewhere in the hundreds... maybe figure another 2 hundred in hand tools and sanding (not including the time) to make your patterns.... and you'd be up and running... vs 10K and up to start in a Cnc machine with the capabilities to do what you want... and with a fairly steep and expensive learning curve to get to where you can use it... mistakes along the way can get really expensive... think hundred dollar cutters ruined because you didn't think through your programming....
from my experience repairs and such are one thing.. what really will stop you will be how good you are with finishes... maybe try putting a guitar grade finish on a few pieces of wood for practice... it's not something you have to do much in repair, but the ability to do it will pretty much determine if your guitars look good enough to sell...