Very nice. What bit do you use to drill all of the holes? Seems like that would take a while with a standard end mill.
Just a 1/8 single flute… it does take a while…
Very nice looking boards!!!
One of my early projects was a cribbage board, and I put a 1/8” drill bit into the router chuck to drill the holes, and specified a tool in Estlcam that had a much faster plunge rate, longer “peck” and really slow X/Y feed rate.
It worked pretty well, but of course required a tool change vs cutting the board out.
The second board I cut, I left the 1/8” endmill in the router, and still had the plunge rate up, and it went quite well. It still takes a long time to drill all of the holes, but if you’ve ever tried to do a crib board on a drill press, the results are worth it.
I don’t trust putting a drill bit in a router. The speeds are wildly different and it just doesn’t seem safe.
But I’d never do a cribbage board drilling by hand… there’s no way I’d be able to get over 360 holes aligned precisely. As it is with cnc, there’s always the odd hole that looks a tiny bit off because of a vibration, or stress in the wood, or something. Like this
And on occasion, mostly when there was a cracked part on the mpcnc 
(but it’s happened other times too), I’d have holes blow out the holes next to them, and have to patch the wood and recut that section… those are the worst, because it’s impossible to perfectly hide the patch
I’m not sure of the difference but they do make drill bits specifically for CNC use.
There are drill bits for CNC, those for example: Sorotec Online-Shop - Werkzeuge 
Oops, Jason said so already.