Build my onw modern NAS & VM-Hypervisor in one

[Enquiries]

I want to setup a NAS which needs to run minimum 4 VM's on it. Graphics is not so important. Maybe a bit of 4k playing of videos might be setup on it as well for some video playback

Disks will be 3,5 Inch SATA III - minimal 4
I want to verify and have some advice on Case, the Motherboard (micro-ATX), CPU and Memory.
I look for DDR5-ECC 128GB (4x 32GB)
1 or 2 M.2 drives is nice for caching read and write or maybe putting them in mirror mode and run 2 VM's from them
Nas fileshares will be SMB and NFS, no iSCSI as it sucks when a connection fails. NFS will just continue when connections restore

Case: silverstone-cs382
Motherboard: asrock-b650m-pro-rs
CPU: amd-ryzen-7-9700x-boxed
Memory: Kingston KSM52E42BD8KM-32HA

Ant tips?

Thanks,
Frans