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A drawing is a good idea to organise your thoughts and work through the alternatives before you start. You will need a framework of some sort to support the rolling roof section and keep the walls from collapsing under the weight - metal shed walls don't have to support much other than the sheets model normally but you need the frame to keep its shape and prvide the rolling track. Just Google 'roll off roof observatory' and look at the images - there are some photos of metal shed modifucations that couild give you ideas.
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