Remember that iNTEL64 nonsense I came up with? The Cartridge Computing System, from an alternate-history where cartridges never stopped being a thing? And of course I built one, partly because I like physical artefacts from alternate universes, but mostly to solve an actual problem.
Anyway, the primary 'cartridge port' has been a separate external unit (because it's really just an eSATA external drive harness), and that meant a separate power switch and separate power cable and separate data cable and all that.
So I decided external cartridge ports were stupid and made an internal unit. Fits in any 5.25" drive bay. It also takes both modern (2.5" SSD) and older, larger cartridges (3.5" hard drives.) Anything SATA, really.
The hardest part was modifying the antique (and weird) Compaq case to look like it had a faceplate made for the iNTEL64 CCS standard. But once I had everything else, I just... had to. ^_^