Sorry I'm a bit late here...
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4. A lightweight steel framed truss roof with foam cored aircell insulation under .42mm trimdek colorbond roofing. The roof will slide off sideways not lengthways. This enables more clearance for the scopes (don't want the bottom of the truss to hit a scope) also enables a smaller rolloff roof receiving frame which is usually ugly.
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Greg,
The other option to consider is a roll-over roof design. You don't have the 'ugly' frame taking up space in the garden and no trusses to hit the scope. Only negative is the small triangle that remains on the opposite wall, but I guess you could put hinges on it.
If you do it in steel, should be easy. Can be done in wood too.
James