The TV-GAME casing is perfect for this project because it already has a 4 AA battery holder, an LED and a Power Switch, not to mention that it is an Atari Joystick!!
How to do it:
First remove the original guts and identify how the buttons and power switch works.
Then, re-wire the power circuit and feed your favorite punk console circuitry. I used a 556 dual- timer dor a smaller footprint and 3 pots, one for volume and two for modulation just as follows: