More Build Notes...
Mounting the Switchcraft short style, LP 3-way selector switch, took a little playing with. First off, the reach nut was a little too long. This resulted in the nut tightening against the switch before it hit the body.
Solution: A little fine, 220(?), sandpaper took about .050" off the bottom surface of the nut.
Now it tightened against the top of the body. Unfortunately, because the top is curved, (carved), it only tightened against one edge, and didn't want to stay tightened.
Solution: I used a #10 O-Ring, (11/16" OD x 1/2" ID), around the threaded portion of the switch, pushed down to the base of the threads. This sits between the switch body and the inner surface of the guitar top, and works sort of like a flexible lock nut. It compresses as the reach nut is tightened, giving the entire inner edge of the switch a resilient surface to tighten against, providing added resistance for the reach nut to pull against, and simultaneously provides added friction to help keep the switch from rotating. Seems to be working nicely.