BigJoe,
It was a 3 x 3mtr observatory for the 12" f5 "Canopus" telescope.
The inner height was very useful, a couple of side doors in the dome allowed viewing down towards the horizon and a simple roll off top section allowed access to the zenith.
Easy to use and very effective.
(Building using larger flat ply panels for the sides and roof, I think, is much easier than than other methods...)
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