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Fans are an excellent idea. They work best if you can put them on opposite sides of the box, one pushing and the other one pulling the air across the board. The sides would be best so that the air flows across the board from side to side instead of top to bottom.
Even if the components don't produce much heat you need air holes because the heat will essentially accumulate with nowhere to go. The more the better, but of course, you don't want the box to fall apart.
Good luck.
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