Thanks for noticing that old thread 😀 here is a more up-to-date version of that "nano-tower" case: Miniature SS7 K6-2 + Voodoo Banshee PC

I also recently made a simple acrylic open test bench for full ATX mainboard + SFX power supply and uploaded the template: Re: What retro activity did you get up to today?
Maybe something like that would be enough? SFX is much smaller than ATX, but obviously still visible.

How much power do you expect these machines to consume? As long as you are not building something like Voodoo2 SLI with Athlon CPU, maybe you could just use multiple Pico ATX/ Pico PSU power supplies and a single 12V power brick.

Wow, I LOVE both of those designs! The acrylic plate you made is beautiful and pretty much exactly what I'm imagining, except one that could stand on its side plus maybe a cover to keep out dust when not in use. I downloaded your PDF template. I've never hired anyone for laser cutting so any advice on what type of machine would be needed would be appreciated!

I realize that I could use 4 SFX or Pico PSUs, but the dream is to be as absolutely minimal as possible. All builds will be able to PXE boot for installing OSes, use SSDs, and rely on my retro network instead of floppy/optical media. With the lack of all of those components, eliminating the need for each build to have its own PSU is my last challenge. Plus one of my systems would be an Athlon XP so the idea that I could re-cap one good beefy PSU with strong +5V rails, mount it out of the way, and be covered for whatever build I decide to display on the desk is really appealing to me!