Some years ago I built a 24 bay system in a Norco case, and managed to get it to be quite quiet.
It’s still going strong btw 
(But now it has more memory, more ssds and an E5-2699A v4)
Now, if I was to do it again, I’d probably just use a Supermicro case.
And I’d still be recommending a 4U 24 bay case, but make sure you get the expander backplane!
Btw, your current system would still be fine to run scale, but you want to upgrade to non USB thumb stick boot drives.