you might wanna check out several reddits
http://www.reddit.com/r/DataHoarder/
or
http://www.reddit.com/r/homelab/
or even more specifically this post here
http://www.reddit.com/r/DataHoarder/comments/1tfepd/52tb_raw_64tb_of_hard_disks_file_server_build/

good luck, i just wish the wife would let me build one myself