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The problem with metal sheds is they are usually all metal, meaning that the side walls are heat sources as well, and insulating just the roof may not make alot of difference. The sisilation type sheeting really doesn't stop heat for long, yes it reflects but it gets hot as well and radiates into the room. That said, Bunnings has recently had rolls of rockwool type insulation on sale for $39 I think it was. If you can attach that to the internal side of the roof it could help ( I think having it suspended by a wire grid might be the only way as no adhesive will hold it against the heat it would be subjected to). You could potentially spray insulation foam on the entire internal structure ( probably would need to get someone in to do that). I'd do the walls as well if your going to spray the foam on. Spray foaming would probably be more expensive than rockwool rolls.
Personally I don't leave scopes mounted in my observatory during the summer, despite it being a raised on stump timber structure and well ventilated. I bring them in the house after each session. I use Suntuff roofing with a big solar powered vent at the roof peak.
Good luck.
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