Double Doink!
After that great win, I went back out to the shop.
I glued the template to the body and set the router up with a 1/2" bit.
I couldn't reach about half of the pockets with the drill press, so I had to go slow on those.
This is the first pass with the short bit.
I progressed to 3/4 and 1" bits until I had 35mm depth including the 14mm template.

Took forever. Like 45 minutes.
But I am rewarded at the end of the day with this sight :
It took a bit of filing in the neck pocket corner and the heel of the neck, but it's snug as a bug