[metafex]

My father makes electric guitars as a hobby, though he doesn't CNC them. He makes stencils from acrylic glass (2-3cm thick) and uses them to cut out the body.

If you really want to use CNC for a one-off you should get in contact with your nearest FabLab or Hackerspace. They usually have something around (though hackerspaces often not and if rather small machines)

My advice would be to ask a carpenter to help you out, if you are comfortable with using the tools, or you bring by the (exact) drawings and a block of wood of your choosing. Once again, if you need special kinds of wood, talk to those guys, the should have some nice dry maple and mahagony around.