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Nice work Brent, I would only make a couple of suggestions. The use of nylon screws and nuts on cold finger attachment points and for through bolting to your bracket will prevent thermal transfer between the cold and warm side , ie improve cooling efficency. Every degree of efficiency helps.
There are plenty of cheap digitial temperature sensors that you could insert onto the finger near the camera sensor, much easier than trying to find exif file data and you can view it in real-time. Finding space for it internally can be a challenge but usually it can be done.
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