At one point, I'd say .. just go with a NAS ? Check out this newly launched 10-bay USB 3.0 external HDD enclosure from Century Japan, the CRST1035U3IS6G. Measuring W179mm x D385mm x H330mm and weighing about 6kg, the enclosure comes with an independent power supply switch (you can power ON individually by selecting the HDD you want to use).
It has a USB 3.0 connection interface, a built-in 140mm rear cooling fan and can house a total of ten 2.5-/3.5-inch SATA3.0 (6Gbps) HDDs/SSDs. The CRST1035U3IS6G is available now for 39,750 Yen (about $390).
Google translated:
HDD is not included in the inner instruction manual / warranty card ※ This product of USB3.0 cable dedicated AC cable door lock key tribe product content · CRST1035U3IS6G body-only. Please prepare separately.
Corresponding HDD / SSD
■ 3.5 インチ SATA HDD (SATA Ⅰ / Ⅱ / 3.0 / 1.5Gbps / 3.0Gbps / 6Gbps)
※ This product is only SATA HDD. You can not connect the HDD PATA (IDE) specification.
※ This product is compatible with 6Gbps, but because of USB3.0, interface side is the upper limit of speed USB3.0 transfer speed.
※ (5 May, 2014) that the Company confirms the operation in the HDD of up to 6TB
Please contact the Support Center for the latest information on supported HDD.
※ In the case of loading and unloading, you may fine scratches in HDD. We ask that on your note, have you previously used.
■ 2.5 インチ SATA HDD / SSD (SATA Ⅰ / Ⅱ / 3.0 / 1.5Gbps / 3.0Gbps / 6Gbps)
※ 2.5 インチ SATA HDD / SSD will be available by using the "inner tribe of" bundled items.
10-Bay USB 3.0 External HDD Enclosure From Century Japan