Almost finished my first (non-kit) CBG of my own design. It's a fretted three-string, and will likely end up with a piezo-pickup option. Have not used any fret markers yet, nor cut any sound holes. Tone actually seems pretty OK with no holes, and it's a really clean look.
I counterbored to recess the screw-together tuners, leaving the main headstock at 3/4". Used a 5/8" Forstner bit in a hand drill to c'bore about 3/16" deep.
Some tweaking remains to be done, but I think it was a good first attempt!