On this particular one all the customer wanted was the cutout of the body. I have seen drawings that detailed the other cutouts and would not be too difficult to do. I'm not a player (guitar) myself so not real sure what you mean by "setup to do necks". Please clarify.
Joe - manfre is correct. The inside corners have a radius of 3/32. Smallest router bit I could (3/16" diameter) get to cut through 3/4" thick material.