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One thing I don't get with this design, you create a cooled metal box with air flow to cool the camera...
Why not directly wrap the camera in aluminum foil four to six times (bar the parts you wish to be exposed) then sandwich this tightly onto say a L-bracket that matches say the rear plus underneath of the camera and attach the Peltier to the bracket and put it all into a snug foam box.
That way:
1. you don't need any air flow - the Peltier is on a metal to metal contact with as much as your camera body as you desire
2. there is no air around the camera to insulate it or trap moisture which may condense
3. its cheap and totally form fitting
4. you can design exactly what parts of the camera are covered or exposed by metal in your cool box.
I imagine aluminium foil will act as a much better heat exchanger than slowly moving air. You could even make a front and rear mold of the camera in aluminium foil (two halves that fit snuggly together) and fit this into your now smaller rectangular cold box.
Does this make more sense to folk? Turn camera on - adjust setting you like, put the aluminum foil front and rear on it and drop it in your cold box, put the lid on and switch on the peltier and you're away!
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