[phkahler]

>> Are there similar size, but less powered (and cheaper) workstations?

I designed this:

https://github.com/phkahler/mellori_ITX

It's 195 x 190 x 60mm and takes a standard ITX board. You'll need to relocate the hole for the fan depending on your motherboard, but CAD files are available and you only need to change 2 parameters (X,Y of the hole center).

BTW mine was upgraded to 64GB RAM and a 5700G (zen 3 APU) but it died and I'm still trying to bring up a newer board - still socket AM4.

BTW to get the center coordinates of the hole, measure from the edges of the board to the top and bottom of the metal plate under the CPU socket and take their average distance. That plate is symmetric and centered under the hole.