Holes Drilled for first Graduations

I used a drill press to accurately drill to 4.5 mm in the top and 6 mm in the back.  This will indicate where the rough graduations will stop. After this, I will do a second drilling for the final graduations.

Finished with the Arches

 It took longer that expected, but the arching is now finished.

I used a contour gauge to trace the arches to see their shape more accurately.