@jk All I can think of are the Shuttle XPC mini-pc designs. http://us.shuttle.com/products/xpc-cube/
Like the SZ170R8 V2 even hides front USB/audio behind a panel https://awoo.space/media/5DXVfF3p1HpGgkUA-Gc https://awoo.space/media/P6jpPwVRQ4wQTQdMnTA https://awoo.space/media/p0vL4WAH2RIl9Fumzbk https://awoo.space/media/Lt3gJGeiCas_pfiE9_o
@jk I don't think I ever noticed it, but now that you mention it, yeah. I guess I'm used to seeing it, since every case has had it since my first 386.
This thing isn't even a cube, it's just a hyperrectangle. I had one that fit a P4, and it was long, dimensions not unlike an old floppy disk drive. But they called it a Cube! https://awoo.space/media/xPjnXdqLdhC8mS7kwy8