Cool! I found the hello blog here illuminating to understand the creators intentions: https://www.furygpu.com/blog/hello

As I read it, it's just a fun hobby project for them first and foremost and looks like they're intending to write a whole bunch more about how they built it.

It's certainly an impressive piece of work, in particular as they've got the full stack working, a windows driver implementing a custom graphics API and then quake running on top of that. A shame they've not got some DX/GL support but I can certainly understand why they went the custom API route.

I wonder if they'll open source the design?