Why Put a Cartridge in a Console When You Can Put a Console in a Cartridge

I get the feeling I've seen this before somewhere, and the creator, dany32412 on Instructables, himself says it was inspired by another source. That's still a functioning Nintendo Entertainment System within a modified NES cartridge, which is a great novelty mod. The difference here is the original gamepads are supported.

NES in a Cartridge [Instructables]