I have plenty of room for a small observatory in my backyard but have been frustrated at every angle by the HOA!! My wife in annoyance said "they've let people build raised gardens, trellises and benches but not a little observatory. That's crazy! Maybe you should change your thinking and put it in the ground with just a flat roof at grade level!@!" I, of course, said that's crazy, I wouldn't know where to begin and I've never heard of such a thing. But….I got thinking, with planning why couldn't I construct a cinder block structure underground with a split fold open roof. I pondered some design issues but think it could be done. My wife (wiser than I) said I should talk to my "stargazer friends" and see what they think. So ….. what do people think stupid idea, interesting idea, what do you foresee as problems?? Thanks for any input. If there is none I probably take the hint and not persue the idea. Thanks for your time and thoughts.