SuperMicro X9SCM-F in other than rack chassis?

[JDM_WAAAT]

The board works in any chassis that supports Micro ATX, it’s not specifically 1U. The only thing that is 1U specific is the CPU heatsink, which you should definitely replace.

[Official] CPU Heatsink Recommendations

Air Cooling Notes Generally speaking, Arctic makes a product that works for every solution. They are affordable, high performance, quiet, and well built. LGA115X = LGA1156, LGA1155, LGA1150, LGA1151, LGA1200 LGA115X (hole/backplate) Consumer motherboards usually have pass through holes. Xeons often have permanently attached backplates, forcing you to use its mounting threads. LGA1366/1356 = Xeon support with fixed backplate All LGA2011 models include fixed backplate, regardless of consumer …

I would highly recommend Unraid over FreeNAS.