The heater assembly was finished by adding a second aluminum plate on top of the power resistors using a clamp made from steel. The five 2.7ohm resistors were connected in parallel using 4mm^2 wire. After testing that each resistor and temperature switch worked the heater assembly was painted using black exhaust paint that withstands temperatures up to 650C.
The heater assembly was then mounted on top of the air vents that blow air to the windshield. The heater assembly is only 30mm high so it does not block visibility much. After it was painted black it fits quite well into corollas interiors. I hope there is now enough heat available to keep the windshield clear of fog.
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