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First few days of progress. The obs is elevated 800mm to get out of the near ground seeing effects which the big telescope is more sensitive to. I'm going to build an isolated pad for the dob to sit on, which will be 50mm lower than the floor height, so drops the eyepiece height a little more.
The floor system is posts set at 700mm to 1000mm in the ground, then bearers and joists attached with some nice James Hardie 22mm Scyon exterior floor sheeting. The dob pad flooring is going to be 18mm compressed concrete sheet. All the materials have very low thermal mass.
The sidewalls will be 900mm high so the dob can see over it. I'm making a steel frame roof and sidewall that will roll off the 900mm high timber wall. I got a great idea from an engineer friend in the US who built a ROR obs. He used roller bearings located inside ezy strut channel as his ROR system. I like the idea because the roof is captive and can't separate from the base of the obs.
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