I’ll be honest that I haven’t watched his videos so maybe it ends up stable. TrueNAS basically says in their docs you can end up with weird issues.

If you host it in proxmox directly there’s less overhead, as in it’s not going bare metal > proxmox > TrueNAS > application. You might run into issues but honestly try it and keep a configuration backup if it fails. Pcie passthrough instead of devices for the HBA card and any external graphics cards works the most stable but you won’t be able to “share” those resources.

I personally like docker for most everything I can with a few things hosted within proxmox. I originally started with portainer which gave me a web GUI for docker but honestly docker-compose files are a better approach. So proxmox > debian > docker Proxmox > trueNAS and proxmox > other VMs. This has its own challenges like passing storage from the NAS to jellyfin but works for me.

As for components, I’m stable on an old office desktop computer potato (albeit it does hit some limits with file transfers and transcoding multiple streams). I wouldn’t necessarily recommend going out and buying an equivalent but if you want to mess around, don’t be afraid of not enough resources in a test config.

For #3 officially, nesting TrueNAS in another hypervisor and then using it as a hypervisor is not really recommended, especially with any kind of virtual drives. It could lead to challenges. Virtualizing drives is definitely not recommended and the most stable choice is passing pcie through with a hba card.

Given that, I have a similar setup and I’ve made backups for important data, I passed a pcie data/SAS hba card that I connect any TrueNAS drives to directly instead of a virtualized drive.

https://www.truenas.com/blog/yes-you-can-virtualize-freenas/