Really, all you have to do is
1. Make an arcade cabinet(a quick google search helps A LOT!)
2. Put a shelf in for the TV to rest on
3. Add in any of your favorite plug and play games.
It's not perfect, because it is my first real project, but I'm still pleased with the results. The marquee lights up, and was made for me at a local sign shop. It was designed after my last name(Neptune is my last name). There is also a holster that holds the "Mission Paintball" gun. Not only that, but after counting all the games currently in the thing, there is over 50 games in total! The only real flaw is that the light inside the marquee isn't diffused, and it gets REALLY REALLY hot after about 5 minutes. But other than that, it's pretty good.
The plug and play games (from left to right) are...
-Pacman (with galaxian and rally x)
-Mrs. Pacman (with Galaga and Pole Position)
-Frogger (just frogger)
-Mini Commodore 64 (with like, 25 games on it
-and Mission Paintball
Oh, and my parents refused to put the TV at an angle. They said it was bad for my posture. :(