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Thanks astro_nutt - that's a nice idea. Unfortunately, in my situation, it has the same drawback as the roll-off shed in that when open it leaves the telescope vulnerable to ambient light pollution. The street lighting in our new subdivision is all full cut-off (thanks to an enlightened developer), but one luminaire is still close enough to interfere with naked eye viewing. Having four enclosing walls even when the observatory is open will (I hope!) reduce the effect of light spill to an acceptable minimum.
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