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I've just started a similar process for my retirement home in Colorado. Heat from the roof will be the killer.
My builder has started that the home will be ICF walls with an R-50 rating and the SIP roofing will be at R-40. I plan on using this as a starting point for the heat transfer calculations.
Other things to consider is the dominant wind direction and making sure your observatory on the windward side of the house. In this way, any heat radiating from the roof will be minimized.
Last thing to consider is the roof pitch azimuth. If you can get the observatory on a south facing roof, the heat build-up should be minimized as well.
OIC!
SideBar: Zego is technically "ICF" or Insulated Concrete Forms. "SIP" = Structural Insulated Panels
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