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Jay. Sounds like fun. The limitation will be condensation on the face of the low pass filter at and below dew point temperature. I have designed a circuit to warm the filter glass, but it is difficult to fit because of space restraints.
I used BluTak pressed into the components of the sensor electronics PCB to exclude condensation, and, of course the sensor to cold finger assembly is sealed with silicon. Providing the cooling is operated just above dew point, condensation won't be a problem.
If on the other hand, you want to go below dewpoint, sealing components is important. Having said that, I have had the sensor temp to -13C iced up for extended periods with no harm to the camera. At other times below dew point and high humidity with water flowing off the cold finger with no adverse effects. A cold box might be different because the cold is not localised.
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