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An easy way to solve the primary dew issue is to arrange a row of muffin fans on one side of telescope such that they blow horizontally across the mirror. It will have the added benefit of disrupting the boundary layer of turbulent air convecting off the primary. I would put them on the opposite side of the ota from the eyepiece.
fwiw) I've just been looking at the construction pics... the workmanship is impressive.
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