I like your schema. I’ve used something similar. My hosts have always been sci-fi space/time ships/stations, user accounts are characters from or Captain’s of said vessels. Over the years I’ve had a TARDIS, Serenity, Moya, Out of Bands II, Galactica, Millennium Falcon, Rocinante, etc. It’s usually whatever I happen to be discovering or binging at the time I setup the machine. For nearly a decade the TARDIS was my server/NAS because it was bigger on the inside that survived through several generations of smaller devices like laptops and raspberry Pi’s named after smaller lighter vessels like Serenity and Rocinante.