I somehow don't get the idea: the only reason is aesthetics? It's just sort of a 3d printed plastic box for the Antminer S9 miner? There are no extra vents or other gimmicks to improve the heating function specifically?
Guessing you didn't even look at the guide XD That's okay lol
Well a post that says - we wont tell you anything about it, look at these great pictures, download this zip file onto your computer.
Now - please - tell me why people should think that is OK?
That's exactly the sort of thing that the majority of the internet knows they shouldn't do.
Though plenty still do it and thus you have virus based bot nets ...