Thats cool!
Purely aesthetically, I think the 3 segment design is best - im sure optically 2 would do the job just fine!
What would be cool is an integrated bahtinov mask + flat panel + scope cap.
You could make the 3 circles of the bahtinov mask slightly smaller, and integrate them into one ring, and have the front cap with 3 sub-apertures in it... Rotate the mask rim to the full right limit = sealed cap, rotate to the full left limit = 3 sub-aperture bahtinov mask.
A secondary motor to flip the whole thing out of the way once focus is achieved.
Weight could be a concern, but then on a C11, all your weight is at the rear of the scope anyway, adding a bit to the front wont necessarily hurt...
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