I clearly had nothing better to do, So I proceeded to design a new replacement rear panel for a Shuttle XPC case, to house a Mini ITX motherboard, and 2 slot graphics card.
The prototype of the rear panel was 3d printed, and bent, to make sure the bend dimensions were correct, with the final version being made as an aluminium PCB (in China) that I then folded using a vise and hammer...
It's running an old SilverStone NT01-E cooler, retrofitted to the AM4 CPU.
Specs aren't overly impressive, but its about the limit of the current 300 watt Seasonic PSU.
Ryzen 5600G
RTX 3050
16gig of whatever ram was cheapest
500gb Samsung 980
2tb 3.5inch - something..