Great design and workmanship, Craig, I love it! that should bring you 5 Stars!
Once I found that technique of Robs, I use it a lot. Even for unconcealed hinges.the biggest problem I had with the dowel segments was drilling the hole in the center. Rob came out with a centering tool that solved that problem, and it works great .
I have the Vertis dowel makers and the use a square strip and clamp in a vise. Then are fed through with a square socket on a drill motor.
Herb