My first NAS killer build, please comment

Component Description Cost after tax (I’m in WA!!!)
CPU Intel Pentium Gold G5400 72.149
PSU EVGA 500W 80PLUS Certified ATX12V/EPS12V Power Supply 100-W1-0500-KR 51.689
MB (Used from Ebay) Gigabyte Ultra Durable H310M A 2.0 Desktop Motherboard 65.049
Case Cooler Master N400 NSE-400-KKN2 Mid-Tower Fully Meshed Front Panel Computer Case (Midnight Black) 65.989
RAM Existing
HDD Existing
SSD Western Digital 500GB WD Blue SN550 NVMe Internal SSD - Gen3 x4 PCIe 8Gb/s, M.2 2280, 3D NAND, Up to 2,400 MB/s - WDS500G2B0C 63.789

The case cooler master N400 provides 7x3.5 HDD bays and 3x5 inch which I can turn to 3.5 if needed.
The MB has only 4 SATA connectors, I have a PCIE -> SATA card that I’ll plug in to resolve that issue. Other than that, the MB is quite good, it has type-c and displayport on the back. DP is a must have!
The SSD is a good to have, I have bunch SATA SSDs already but dont want to waste any SATA connectors if I need to run a lot RAID.

The PSU has 6 SATA connectors, so I spent a couple bucks on Amazon and bought a SATA power splitter ( 1 -> 4)

I do have some good DDR4 RAM that I’ll throw in so I’m not buying new ones.

Hope this will run smoothly, I particularly chose G5400 because of its low power, the T series i3 and i5 are either hard to find, or for OEM only that I cannot find for retail at all. The total price runs a bit above my limit but if you dont count the m.2 SSD, it’s well controlled within the $250 range, not bad, given this can last really a long time hopefully.