If you need a external enclosure ( no CPU/MB ), you can build by some optical drive enclosure.   For example, below is a 9 5.25 bay ( 13 disk ) enclosure, the height same as a mid-tower or not wider then a rack ... those are short in depth (~40cm) . The build still not complete, enclosure come from China and not in good build quality, but it really cheap in price. If you need quality, you may use istarusa s915 or s917.      
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