Step 1: Tools and materials that you need
As materials you need 80*90*1.3cm Agglomerated for the foundation, a 80 * 110*0.3cm wood use for the back of closet (it's a flexible wood)
- some screws and nails
- a broken USB pad or keyboard (with the electronic in working condition)
- some wires
- copper foils
Step 2: Let's get started !!
Then cut 10 pieces of 80 * 2 cm in the 3mm wood.
Step 4: The Hard part (if there was one)
Step 5: Is it finish ?
Go get them together with some screw !!!
And what to do with the wires ? well sold them in your USB "controllers" in place of the buttons for a pad or in place of some keys of the keyboard for a broken-keyboard.
Then test it and maybe you have to adjust the quantity of foam under the copper or maybe add some between the two layer wood because some buttons are always active it's up to you to tune it like you want.
Then paint it an go get some sport on stepmania !!!