I don’t have one off hand but a NAS at homelab level is not that different from a server.

I have had success with getting a second hand server with a moderately powerful processor (old i5 maybe?), a good 1/10Gb network card (which can be set up with bonding if you have multiple ports), and lots of SATA ports or a raid card (need PCI slots for the cards as well).

I would go with even a lower power processor for power savings if that’s a thing. ECC ram would be great, especially for ZFS/btrfs/xfs.