Hot AF !
For years I've been toying with the idea of a fat tyre fixed but nothing existed. I finally "hacked" my Pompino last year, as a proof-of-concept. It works, but it is far from ideal in terms of clearances, and lacks the refinements such as fenders and lights (not to mention quite heavy, not a very "refined" ride)
Your bike and @cgg's Stayer are exactly what I had in mind : super functional, super clean in execution, absolutely lovely.
I hope having one made eventually by @Hulsroy and join the club :-)