Right, still a 4bay. It can look like a sub 1k build is great but it really isn't in my experience. Its far easier to just grab a matx case and a hot swap dock from icy dock or whoever and the cost can be $100-150 depending on quality case and number of docks you want. But its not small or as small. Thus, the off the shelf stuff looks better even if the cpu is weaker etc..Or the Supermicro CSE-721TQ-250B possibly. Supermicro is quality and it's only 160 bucks on Amazon. 4 slots only, alas. I have read more now and there are complaints on the Silverstone indeed. So perhaps the U-NAS NSC-800 is the only affordable somewhat small 8 disk case.
The u-nas also requires 1U power supplies.
This is one of the better options I've come across (thanks to this forum) for itx, but you're buying the hotswap bays or 5.25 converter bays etc.
or this Norco, I haven't tried it though. 1U psu again.