It's feasible, but then problem is that it's only the equivalent of dropping your ambient temp by about 20 deg C, so you still have to have an active CPU heatsink, which defeats the purpose somewhat.
An HSF cpu cooler alone should work well under those circumstances. Everything else could be otherwise passively cooled.
Condensation is a possibility, but with some basic precautions, it can be avoided. Keeping the fridge closed at all times is a good step.
On second thought... that fridge might have a defrost cycle, in which case the ambient temp would rise quickly to 20C, and possibly higher. This is not bad, but it would give you a computer that performs differently depending on which cycle the fridge is.
I wouldn't recomend it.
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