The observed attempts to soundproof at least something, in my opinion, only increased the temperature in the case. When assembled, in order to make it at least not hot inside, you need to turn on all the case fans at least in medium mode and this is not silent. As a result, I came to the same thing with which I lived in the previous system unit - I use this business without both side walls, I don’t need to turn on a single case fan, while silence and coolness. I will add, if you have a loaded 3.5 HDD, the standard installation does not have contact with anything that removes heat - all hope is for the fans in the front panel.
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