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Update. The work progresses.
Moisture barrier for sensor electronics (BluTak pressed around components). I've used this technique before. It is quick, convenient and effective. The cold plate will hold it in place as well.
Fitted cold plate
TEC module - Mistake with my measurements, here. Too wide and blocking the CF card holder. Narrower TEC required. There's a metal retaining tag folded over the plastic sensor filter frame that sticks out 2mm...
At this stage the TEC could be left out. Extending and widening and bending the tongue to contact the chassis, with plenty of contact area, might be adequate. A slim heatsink might do the trick too (40mm x 13mm x 5mm) Perhaps extend outside the body under the CF card to an active heat sink.
Another method might be to machine the whole cold plate from aluminium block with appropriately shaped cooling fins.
This one is destined for a slightly smaller TEC.
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