I've been through the "obs mill", and after years of deliberation have opted for a "pier garden", with a dehumidified and wood heated warm room within elect cable distance of my 3 piers, and a concrete ramp to wheel out the big fellas. I find proprietary obs somewhat cold and cramped anyway. Having said that, obs are very much a personal preference thing. As for the mini dome, my idea when considering same was for a simple hatch/box on a rotating turret. Doesn't have to be round, and you can "hinge" same with a prop system at varying openings if you don't want to open the aperture fully. Keep it small enough to fit on a box trailer in parts if you are in the situation of possible future moves. Think outside the box! Employ the KISS principle. Think of the 2.4m cut sizes for timber - much cheaper/available. The tilting hatch is good as it doesn't have seams near the zenith, avoiding drips on your gear.
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