If you need a 12x3.5" JBOD, could do a bunch worse...It is only SAS1, but the sas2826 backplanes are readily available for $30 on ebay. Usually these are missing they trays, which is frustrating.
Absolutely no reason you couldn't strip the power board out and put a motherboard in, either.
QUANTUM DXi6500 SUPERMICRO CSE-826 12-BAY JBOD SAS STORAGE ARRAY CHASSIS JBPWR2 | eBay
(1) - QUANTUM DXI6500 SUPERMICRO CSE-826 12-BAY JBOD NAS HDD SAS STORAGE ARRAY DISK DRIVE BACKUP CHASSIS DXI650-C CSE-826
• (2) - ABLECOM PWS-801-1R 800W REDUNDANT SWITCHING POWER SUPPLY 672042002948
• (1) - SAS DUAL PORT EXTENDER CARD GT432E002LF
• (1) - SUPERMICRO JBPWR2 ARRAY ATX POWER CONTROL CARD
• (1) - SAS826EL1 BACKPLANE
• (1) - PAIR OF RACKMOUNT EARS
• (12) - HARD DRIVE CADDY
• (2) - POWER CORD
Absolutely no reason you couldn't strip the power board out and put a motherboard in, either.
QUANTUM DXi6500 SUPERMICRO CSE-826 12-BAY JBOD SAS STORAGE ARRAY CHASSIS JBPWR2 | eBay
(1) - QUANTUM DXI6500 SUPERMICRO CSE-826 12-BAY JBOD NAS HDD SAS STORAGE ARRAY DISK DRIVE BACKUP CHASSIS DXI650-C CSE-826
• (2) - ABLECOM PWS-801-1R 800W REDUNDANT SWITCHING POWER SUPPLY 672042002948
• (1) - SAS DUAL PORT EXTENDER CARD GT432E002LF
• (1) - SUPERMICRO JBPWR2 ARRAY ATX POWER CONTROL CARD
• (1) - SAS826EL1 BACKPLANE
• (1) - PAIR OF RACKMOUNT EARS
• (12) - HARD DRIVE CADDY
• (2) - POWER CORD