The first thing you want to do is flip the Virtual
Boy over and locate the 12 screws.
The next thing you want to do is remove the visor.
Then you have to remove the screws, which can be done by having the right screwdriver or making one (I made one).
To make one, take a flat head screwdriver and use a dremel tool to notch out a piece of the screwdriver so it grabs the notches in the screw.
Here's a closeup of the head.
You can also modify a security bit like shown HERE.
first thing to remove is the bottom plate that attaches to the stand.
Then remove the bottom half.
Then spin it around and remove the eye pieces.
Then remove the side speakers and unscrew the boards attached.
Then lift the insides out of the red plastic top.
Then you have the center module of the Virtual Boy which has nothing that can be really taken apart.
Now that you have ripped your Virtual Boy apart, there is not much you can do with it. You will need to pull it apart to repair the system, or to hook up the Rumble Pack or other mods, but other that that, there is not much that can be done. I have a few ideas, like hook up an audio input so you can listen to an audio CD through the integrated speakers (which I love) while playing the game, or some cool LEDs that show it is in use :-), but neither are very useful.
After you put it back together, you might want to put in standard phillips screws to make it easier to put together and so you can open it again if you want, and make sure you check the alignment by inserting a game and pressing Left, B, Down, A, Up on the right D-Pad.