Kooter, on second thought I'd rather see something very low profile that didn't protrude from the lens very much. Maybe half or less than the E1E bezel you made.
The six scallop is nice, perhaps a bigger diameter mill for the crenelations.
With the low profile, the holes would probably not work.
But these are just my thoughts, build them the way you see fit.
My use would not be for striking anything, but more to protect the lens/head from drops, and a personalized touch.