I don't know what type of lining your freezer has, but it would need to be a material that would resist the effects of the anodizing electrolyte. One particular area that may leak even if the lining stood up is the drain, they don't seem very adequate for a water tight seal, let alone acid where the results of leakage would be a big problem.
Have you thought about just setting up a larger tank, as it would take longer to heat it up?
I need to deal with cooling a tank too, I don't know exactly what I'll do yet. I figure I'll need more than a simple heat exchanger cooled with room temperature air and a fan. I may fabricate a titanium heat exchanger and use a small air conditioning unit to control the temperature. The store area of this site has a chiller unit too, and might be a good option.
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