Aluminum routing guide for the slots, with registration guides on either side and at the top. I've hogged out most of the wood with a 1/2" Forstner:
Headstock bolted into jig for slot routing:
Routing the slot with a 1/2" "shear angle" bearing guide bit:
Underside of jig is ramped, with maple registration blocks which fit the slots:
Headstock registered for beveling one slot:
Top view, bevel routing:
120 degree chamfer bit routs bevels:
Bevels routed in both slots:
The finished headstock
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