This may be a stretch, but I stuffed a Full ATX, SLI GTX 970 gaming rig into an IKEA Kallax cube for the living room. With the door closed, you'd never know
Fitting an Ikea Kallax Bookcase by sleiper - Intel Core i5-8400, GeForce GTX 960, Fractal Design Node 304 Mini ITX Tower - PCPartPicker
pfSense Router In Ikea Kallax - Cases and Mods - Linus Tech Tips