We've shown you how to turn your computer into a retro arcade and even how to combine it with your living room media center. Instructables user Beave2012 gives his an old school feel by using an old NES as the case.
Sure, you could just use a regular computer case, but what's fun about that? This project gives your all-in-one retro game console a real retro feel, and if you've hung onto that old, broken NES all these years, why not put it to use? Beave2012 lays out all the parts you need, though you could probably tweak it if you wanted to use a different motherboard or other computer parts — just make sure it all fits inside the case. And whatever you do, don't take apart a working NES console! There are only so many left working in the world!
Retro All-In-One Gaming Console [Instructables]