I used to build my own PCs and servers. Now I just use SFF and laptops at the desk, and virtual servers.
For several years in the mid-2000s my main machine was a caseless art-piece wall-hung custom build that was pretty unusual...
I had a big 3/4 inch plywood sheet covered in black fabric, hung on the wall behind my desk.
In the middle of it was the motherboard, screwed directly into the wood.
All cabled components - power supply, hard drives, discs, card readers - were screwed to the board around the motherboard. The wires were channeled out to the components.
It was intended to look like an exploded diagram of a PC and components, but actually working.
I had all SilenX fans and power supply to keep it quiet.
Had to deal with drive heat - was surprised how hot the hard drives got when not screwed into a metal cage that can act as a heat sink!
I spent a lot on cables to have particular appearance or to have enough length - especially the power cables from the PSU to components.
All the "external" wires hung straight down to my desk.
It looked pretty cool, and a surprisingly broad group of people enjoyed it, but I don't have any pictures. It certainly made checking or tweaking the hardware really, really easy!