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Can I ask why a light weight modified cover of suitable width and a custom handle fitted to a 3rd OTA ring or similar is not used?
Any low profile cover with an edge that doesn't come into FOV would do , the brim covers the mount, camera's other bits with a brim wide enough to let the dew run away and fall harmlessly.
Using the 3rd OTA ring gets you your tent pole, the sail cloth design would be fairly easy if you have the parts to measure straight from. Seems to be an easy option with little expense, less cables, no power requirements and probably lighter.
Ps.
I had thought of hydrophobic paints, below is a sample of Neverwet(one of the best) on aluminium under dew conditions.
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