It's understandable that you want to take your virtualization-capabilities to the next level but I also don't see the appeal of containerizing unraid like many others here. I started using unraid last autumn and to me it really is about being able to mix drive sizes. It's a backup to my main server's ZFS pool so (fingers crossed) I don't even really worry about drive failures on unraid. (I have double parity on ZFS and single parity on unraid.)
Anyways my point is I started out with 8 SATA slots plus an old USB-based enclosure with i set to JBOD mode and that was a pretty stupid idea. unraid couldn't read SMART data from those USB drives. Every once in a while one of the drives would suddenly show up as having an unsupported partition layout. Couple weeks ago all 5 drives in the enclosure started showing up as unusable. So as you can imagine I dropped that enclosure and now am working solely off the 8 internal slots. I'd imagine that virtualizing unraid's disk access might potentially yield similar issues. At least the comments of people here remind me of my own janky setup.