Molex to SATA adapters and RAID controllers, problem solved lol.
The 1200W Thermaltake Toughpower PSU's each have 8 SATA and 8 Molex connectors. That makes 32 connectors in total. The other 16 connectors needed can easily be made up from Molex "Y" splitters and molex to SATA adapters. He could always borrow a few connectors from the 300W Chieftech PSU powering the Atom system. Plus he needs to power the DVD drive.
Attaching the drives to the system may be hard though.
The ASUS P5Q Premium motherboard he is using has connectors for 10 internal SATA drives and a single IDE channel so that is 12 drives in total. The other motherboard, the ASUS P5K Premium, has internal connectors for only 6 SATA drives and a single IDE channel, that makes 10 drives total. So combined both motherboards support 22 drives (18 SATA and 4 IDE). So RAID controllers are definitely needed.