Very nice, I have a similar setup but I use parsec to remote in to my gaming VM that has GPU passthrough. One interesting thing I noticed was if I wanted hardware encoding on my Plex server I had to pass the Intel quicksync extension as a PCI passthrough!?

One thing I want to experiment with is a raspberry pi that controls the larger homeserver such that I can remotely turn it on/off for power savings, but I want to do it in a seamless way. Something along the lines of if there's traffic to my Plex server the pi can detect the attempt and spin the VM up on demand