For a long time I used an old IBM minicomputer case as a PC case, just put a few blanking plates in to cover the large hole in the rear, which used to have an A3 size heatsink on it, put the PC power supply in the base and wired it up to the mainboard. Kept the fan hole, but put a regular 120mm 12V fan in there instead of the 115VAC one big blue used, a lot quieter. Mainboard on the middle, and the hard drives on brackets and the FDD drives through the front panel Monitor on the top of the case, at desk height, and keyboard in front of it with the mouse, all on the metal case.
Lots of spare place, even put the UPS in there in the bottom. Never thought to take any photos of the thing though, and when I moved I scrapped it, obsolete, and I had been sitting with a beige box on top of it running Win98.