My understanding is that a neutral air pressure inside the cabinet would take care of overheating. Air intakes and exhaust will have to be channeled through foam lined fins in order to absorb the noise. At least that's the concept I see most commonly in designs of other people. Or perhaps, something like this :

https://www.youtube.com/watch?v=dpGuDAWb4hQ

or


https://www.youtube.com/watch?v=LMqAv7k9g4U