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I'm still finishing my observatory, but, I have a 10" newtonian which has a tube length of about 1.5m. My observatory is 3m x 3m and I find it very comfortable to move around without knocking things. I don't know how long your telescope is but I imagine you could get away with a smaller footprint than this. My doors open into the observatory as well so I needed to have a bit of room available just to get in.
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