This kit uses SATA, relying on one of those M.2 6-port SATA adapters for the split-out, and a custom PCB sandwich that routes the SATA signals to three sets of

This kit uses SATA, relying on one of those M.2 6-port SATA adapters for the split-out, and a custom PCB sandwich that routes the SATA signals to three sets of two slots.