Worst case scenario, you can resell it, install a Server OS on it, etc. and put it in your living room to show off :)  The CaseLabs case looks cool, but you will have to do the same kind of homework on get compatible (and inter-compatible) parts for it. Like I said, there is a good chance everything will install and run just fine ... you just have to be prepared for the unknown when venturing off the beaten path.  If you have someone knowledgeable that can at least get you headed down a direction where there is some visibility for success, that would be helpful ... good luck!
Can I install Windows 7 on a Dell PowerEdge T620 server with these specs? TPM motherboard  Intel Xeon E5-2620 2.00GHz, 15M Cache, 7.2GT/s QPI, Turbo, 6C 95W  Tower Chassis with up to 8, 3.5" Hard Drives  1333 MHz RDIMMs 1 8GB RDIMM, 1333 MHz, Low Volt, Dual Rank, x4 Intel Xeon E5-2620 2.00GHz, 15M Cache, 7.2GT/s QPI, Turbo, 6C 95W  600GB 3.5-inch 15K RPM,6Gbps SAS Hot Plug Hard Drive  PERC H710 Integrated RAID Controller, 512MB NV Cache, Full Height  16x SATA DVD + / - RW Drive (with RAM) for Ms 2008 R2
Windows 7 on Dell PowerEdge T620 server