Wii Fit - modular balance board riser

I wanted to make something to make the Wii Fit workouts a little more challenging, so I decided to throw together a quick way to increase the height for the stepping and boxing. So, here it is.

This is my first instructable... If you see anything that is missing, or should be explained further, please let me know. Comments, suggestions and ratings would be appreciated.

Step 1 Gather up the parts

To make the same configuration as I did, you will need:

Some kind of "board"... I used a sheet of MDF cut into 3 12x20" pieces
2x4 - 4 pieces @ 12" long
Some screws to attach the board to the MDF
Some kind of "pin" to attach the board to each other - I used 8 rivets
Drill
Hammer