I finished the above JBOD DAS box build. I'm happy with it. Not much to it. The only components in the box are the power supply, the SFF-8088 to SFF-8087 feed thru, and the SFF-8087 forward fan out cables.
It provides me another 8 bays of hot swap 3.5in in either SAS or SATA flavors. I'll be buying SAS drives for it once I need to populate it further.
Google is your friend and Bob's your uncle!
RAID - Its ability to disappoint is inversely proportional to the user's understanding of it.