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I built a garden shed observatory similar to the one Bojan posted.
You will need an internal frame and lining which is easy to fabricate because you are just adding stuff..you roll the whole lot off so you need a door and wheels. I looked at building another recently but as I had other materials sitting around I did not go that way.
I would concentrate on the cost of the frame and lining...also insulate it.
Good luck.
Alex
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