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Wow, that sure isn't going anywhere!
Those stone walls - are they retaining walls? You're not building the observatory walls using them are you? They look like they'd retain a lot of the daily heat and radiate it up for hours in the night.
Lightweight walls would be the go. Timber or metal frame and colorbond with aircell insulbreak is what I used and it works great. During a hot day the observatory is reasonably cooler inside. I have it under the roof and walls and spray painted it matt black as it is silver otherwise.
What about roll off roof and wheels etc? That can be tricky and really affect the outcome.
My advice here is:
1. Ask on the forum for various systems as there are many ways of doing it.
2. Make sure the roof clears the scope so if the scope swings it can't hit the roof. Also that a truss horizontal member clears the scope.
3. Keep your walls parallel and work out the track system so the roof rolls off and closes fairly easily. If you go to Bunnings your wheel choices are very limited. Richmond Castors and wheels have lots and I think they have an online store. They are in Wetherill Park Sydney.
4. You could use 100mm C purlin for the track, it comes in 6.1 metre lengths. I'd ask around as there have been some nice systems here and mine has been a source of trouble.
Greg.
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