Sorry just saw the post, the case itself is made by CiT, but I've had their cases before and they've been better, the one I got from a decade ago would have been perfect for this build for the price except I'm using it on my P3 rig.
I just realised though after my post that my shuckered WD HDDs are missing the middle screw hole, likely what they were intending it to be used with but I never noticed until now.
Still not a case I'd recommend unless you have to:
https://www.amazon.co.uk/dp/B01BV8JU96
In the end I had to squeeze the Two HDDs at the bottom and 3D print a bracket for the third one as those brackets I bought were useless with the HDDs.
Only reason I didn't buy a better case was because I don't know what I'll be doing long term and didn't want to waste money when (I thought) this will do for now.
Also turned out 1 of the HDDs had the WD 3.3v BS, fortunately I had a spare power splitter lying around which I ended up using, thought I killed the HDD for a second.
So far with the 4100 I got it down to ~50w idle with the HDDs spun down.
As of now I've put Slop in it's location and I'll see how things go.