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Thanks for the replies.
One area of trouble in the past observatories was the wheels and track.
Last I looked into this there is a sliding gate track sold at Bunnings. I think they also sell wheels that fit over the curved rail.
Any advice about wheel and rail setups?
I am thinking of an aluminium frame and aluminium roof sheets with some insulation under it for a roll off roof. I don't think wind is going to be an issue but will know within 2 months.
Greg.
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