@Unaccounted4 i7-4790k. Will sell as a special version. I already 9020 without mods, just Libreboot, and that one has i5-4570. The default 9020 SFF machine can't handle higher than 65w CPUs. 4790k is 90w.
I've been experimenting with this, testing various mods. What you're seeing is nearly the finished product; I just need to design that custom side panel with extra ventilation holes (to improve airflow).
Without these mods, a 90w CPU will overheat and throttle. I have my 4790k running stable.
@libreleah Yeah, there's not much a gap for airflow with the stock side panel for a downdraft cooler. Still, damn impressive!