Welcome to CigarSmokers from Ottawa, Canada!
I'm planning on doing something similar to what you are - got almost all the bits, just don't have a need to do it quite yet. I will post pics/instructions once it gets warm (20F here right now).
In your case, it might be easier just to get a 12v cooler with a Peltier and fans and stuff already, like a Coleman Powerchill or Koolatron or Mobicool, and wire in a thermostat for a motorhome or electronics (because they run on 12v) and plug the whole thing into a 12v power supply.
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