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G'Day David.
The moisture barrier is essential if you want to stop the roof from condensing and dripping all over your scope.
Insulation, well... I'm not so sure. Insulation just means it heats up and cools down slower. Not sure if that's really what you want.
With insulation, it won't get so hot in the middle of the day, and it won't get so cold in the middle of the night while its closed, but it will take longer to cool early in the evening.
Rather than insulate, I would probably try to double skin the roof (and maybe the western wall?) so air can circulate between the two layers. Without insulation the obs will follow the ambient temp as quickly as it can, but the double skinned roof will stop a lot of heat entering from the sun.
Al.
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