This build started with with this post.
I received my used Supermicro CSE-745 server yesterday along with some other parts and the RAM upgrade today. Still waiting on the hard drives and SSD from Amazon(they or the USPS seem to have misplaced the package), but I went ahead and started playing with it using an old laptop drive I had laying around. I have installed ESXi and now have a Centos 7 VM installing to play with; I'm planning to use Rockstor with BTRFS for NAS duties.
Specs when finished: Supermicro CSE-745 chassis Dual Redundant 800w Supermicro PSUs Supermicro X8DTH-6 motherboard 2x Intel Xeon e5506 quad core CPUs 48gb Registered ECC DDR3 120gb SSD for VMs 5 or 6 2TB Hitachi HDDs Optical Drive(BluRay if I can get MakeMKV working in Linux)
I'll take some better pics when I get the drives in and everything setup.