Love all the old Sun workstations. We had tens of thousands of Sun and SGI workstations at work. I started with a Sparc Station 20 then to a Ultra 1 Creator, Ultra 2 Creator, Ultra 30 Elite, Ultra 60, Sun Blade 1500 and 2500 before we went to Windows Vista.
Many engineers grew up with Solaris workstations at their main computers, and bought off lease workstations for home machines, just for normal home use. I had a Ultra 30 at home and came very, very close to buying a Ultra 45 (glad I didn't, those things were monsters)
I was part of a training team that had to teach many users how to use Windows Vista when we finally made the switch to
Windows for engineering workstations. There were users who never used Windows before, but who were quite proficient on Solaris.
There are still some users who still use the Sun three button (no scroll wheel) mouse
I really enjoyed reading of this build,. It is an interesting chassis, that's for sure. And those EPYC processors are huge, they're bigger than Skylake SP.
Regarding fan orientation air flow etc. Patrick addresses this on page 5 of the article with a few possible solutions. NOTE: My two cents.... a blower type GPU card (see attached image) which exhausts it's hot air out the back of the chassis might help too, instead of a GPU that exhausts hot air back into the chassis. But man, those GPUs are not cheap and probably not somthing you can change out at a whim . Be interesting to see various system temps at idle and with cpu and/or gpu under heavy load. If the temps are good, i probably wouldn't change anything.