Decided to migrate my hardware back to my preferred PC case with better airflow and dust filtering.
The only difference being the smaller case required an mATX motherboard. Same manufacturer, same chipset, though I got a little bonus in the form of an updated BIOS. More current than on my ATX board that had my "Sleeper" PC. Though I had to learn a somewhat different BIOS setup with the mATX motherboard. I survived...
Great to be able to use my exact same removable drives with three versions of Linux. With no software modifications required. Linux Mint 22.0, 22.1 and Pop!OS22.04 all running fine. My "Icy Dock" removable SSD tray is at the bottom of the case.
Note the enormous frontal fan is 180mm while the rear exhaust fan is 120mm. -Positive airflow. Unfortunately the fan is DC and not PWM. I think I'm going to buy the PWM counterpart that Silverstone makes. Note as well the side of frontal case grill. A mesh filter covering the grill slides out for easy cleaning. (On the other case I had to remove the entire front of the case just to clean a 120mm frontal fan.)
And no, you aren't hallucinating. The motherboard is in fact, inverted in this case.