This is barebones, so no CPU, RAM, or HDDs, but it's I think it's a nice platform for a NAS build with 12-bay 3.5" LFF. Should be able to accept most E5-2600 v2 CPUs, and DDR3 RAM is now down to around $25-30 per 16GB RDIMM for 1600Mhz. I think the included 2008M-8i is a LSI SAS2008 based SAS card? If so, maybe possible to flash that to IT mode?
Cisco UCSC-C240-M3L 3.5" 12-Bay LFF Barebone 2U Server CTO - No CPU, RAM, HDD 658759208651 | eBay
Cisco UCSC-C240-M3L 3.5" 12-Bay LFF Barebone 2U Server CTO - No CPU, RAM, HDD 658759208651 | eBay