Oh hey, one of my marginalia scribbles from the early 2000s had deep prior art. I was really hand-waving the capabilities of USB2… and picturing a vertical stack of fixed-footprint components. Back then, they would’ve needed an absolute shitload of pins, and these cases are friggin’ massive if everything’s sitting flat across a desk. Even the small stack in contemporary mockups is a fat cube.

It almost makes sense if it’s a throwback to Altair / S100 backplanes. Like your motherboard is just a row of PCI slots. Raw bus. You could expand that by daisy-chaining units. Might even be able to hot-swap entire drives so long as the OS knows you’re about to.