Maybe a four flap, hinged and spring loaded design connected to a servo to via serial to a PC - I could see this would be non trivial.
Its fun isn't it? I have yet to motorise my dome but I find it great simply when I don't want to spend hours in the cold to get shots.
I wondered - do you have your camera on some sort of motorised rotating platform to frame your shot the way you want it?
Lots of electronics to control!
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