Note that here DIY means designing the chassis, the drive loader mechanism, PCBs for backplate, power distribution (including crimping dozens of power cables),

Note that here DIY means designing the chassis, the drive loader mechanism, PCBs for backplate, power distribution (including crimping dozens of power cables), modding PCIe cards to fit. It's not a boring "I bought a Chia mining server and inserted lots of hard drives" build.