Is this a good first homeserver?

I don‘t know if this is the right place to ask, but is this an OK build for a first start in selfhosting? Is there anything obvious I could improve? I‘d mainly run Nextcloud, Immich, some Docker containers and smaller web applications and cronjobs.

de.pcpartpicker.com/user/libewa/saved/94RtK8

If you’re already going for spinning rust hard disks, why limit yourself to the 3 TB ones? IMHO, these days, spinning rust only makes sense at 8 TB+ per disk.

I have them at home and as such don‘t need to spend money on them.