So the build took around 5 hours.
Mostly because I had no light, cable management was a fucking pain in the ass, and my hands are too fucking big for ITX.
My old PC is now going to be acting as a server.
Time to in-place convert it from Fedora Workstation to Fedora Server (just removing all that graphical and audio stuff, who needs that?).
Also my ATX PSU cable was too short so I had to compromise and unscrew my PSU from the case to give some length.