The first month of [WoolyDawg5's] summer break went into building one Nintendo emulator to rule them all. He thinks there’s nothing like playing the games on the original controllers, and we agree with him 100%. Here you can see that the cartridge door on this NES enclosure hides the extra connectors he needs.
With that door closed this looks like a stock console, but only from the front. If you take a look at the back of it you’ll see how he pulled this off. There’s a Zotac motherboard whose I/O panel has been fitted into the back. It’s responsible for emulating games for the NES, SNES, and GameCube consoles — we’re sure it can do more but that covers the controller ports seen here. Each port is wired to a USB controller module. The cables for these modules exit the back of the case and plug into the motherboard’s I/O panel. There is WiFi for the board, and that’s what [WoolyDawg] uses for configuration, tunneling into the OS instead of connecting a keyboard or mouse.
Of course you could just shoehorn all-original console hardware into one package to accomplish something like this.