a bunch of ebay specials with more ebay parts scavenged over time + some 3d printing.
The centre tower has a miniitx mb and PSU behind those panels to run the NAS, and the drive bays are in the bottom.
The right is a failover cluster that isn't finished yet.
i'm not utilising it nearly as much as i should which is why i haven't gotten around to the failover cluster yet.