..This is where the joining 1/4" diameter by 3/4" long NC thread (13 per inch) aluminum studs fit. they will be epoxied in place with thickened West Marine Epoxy resin. (degrease first)

..My present method of neck joining is to perfectly fit the back of neck to the rib structure leaving the ribs intact. This to enhance the sound transmission from neck to rib structure. Layout holes are 5/16" in diameter and 0.45" deep each side; up 1/4" and 7/8" on center from bottom.

..Fit carefully in the layout fixture. Check fingerboard surface exactly level side to side with a level gage.
..Use carbon paper and chalk to refine the back-of-neck shape to match the rib surface exactly.