Nice, hope you'll have fun building and deploying your server.

Cases like NR200 would also fit a few 3.5" drives, but the reason I couldn't fit my current server into a SFF-ish case is that the mobo is mATX and I have all PCIe slots full. Most of the SFF cases (even if they fit mATX) not enough space for my PCIe needs.

I could upgrade to a built-in NVMe and SFP+ (or downgrade to 2.5GbE), but I don't want to spend that kind of money just to save some space I don't really need to save.