First Home NAS Build Recommendations

After many hours of trying to research and understand, I am thinking I could try to build this:

Case:
Lian LI PC-Q25 Mini-ITX Tower NewEgg 100.00

Motherboard and Processor:
ASRock C2550D4I Amazon 325.00

Power Supply:
Seasonic SS-440FL2 Amazon 110.00

RAM:
ECC UDIMM 1222MHZ HP (2x4) EBay 140.00

HDDS:
WD Red (4x2TB) Amazon 400.00

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First Home NAS Build Recommendations