this would work but then you take up extra space with an extra case, you lose performance by switching them from SATA to usb, and you tap out your usb bandwidth for other devices. not to mention you now would need another psu to power all the drives in the other case. and watercooling 5 drives would probably cost a shitload more than buying a larger case and be a major pain in the ass to setup, assuming theres room in the case.