Matt, anything is possible if you put your mind to it.
I agree with Greg about using the insulbreak by Aircell. Good stuff, we use it in the building industry and it does help.
I deliberately did not put any windows in my observatory. Sunlight enters this way and heats up the area faster. Using slots in the floor or wall sides with a whirly bird is a good idea. False floor is going to work for you too. Having a warm room looks like a pleasant idea. Considering an extension to my obs with a warm room too.
Plant nice thick scrubs around the west and east walls too, this helps with creating a micro climate which ultimately keeps the heat out.
Certainly a good use of an very rigid structure and no building necessary. It took me nearly a year to totally complete my observatory, and there is still stuff I would like to do. By taking this approach you will save yourself a lot of construction time.
I like the idea.
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