I've looked at building a simple panelled 'dome' for mine to gain some roof height for the 10" Newt. Biggest problem is it raises the horizon line for everything else. Also complicates construction and involves a rotating joint at the junction and weather seal issues.
My 'Split Roof' is working well for me at present. Easy to open, locks down and seals quickly and is adjustable for the width needed to be open and thus useful for dew mitigation. No rollers required as it is light and each half is quite small so they just slide along the top rail of the shed. I just wish I'd made it a bit higher in the middle although it's ok when all the refractors are loaded. If I leave the Newt on the mount I cannot park it at home position but that is manageable all the same.
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