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John, an intriguing idea. Having two concrete water tanks on our property, Brent's comments are appropriate. You should have a relatively cool stable environment in the tank. However I think there a couple of issues to tick off:
I would be giving some thought to ventilation, or more correctly the lack of, in a solid tank that may lead to mold problems. This is especially so in the cooler months where the inside temperature will be lower and dew and other moisture settling inside during observing sessions etc is likely to cause mold and other problems if there is not sufficient ventilation to get rid of it.
Are you considering insulation under the roof - it is surprising how much heat is transmitted through and radiated off the inside of an iron roof on sunny summer days. Again, lack of adequate ventilation may compound this.
Maybe I should be draining one of our tanks and doing the same!
Keep us posted on progress.
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