you first need to start by getting all the materials. After that take the Arduino and get all the code loaded onto it with the Arduino IDE application. Next, get all your sound files on the micro SD card in the serial mp3 player. After that wire it up and search for a tutorial on how to do that. Then engrave your board with what you want to have on it. While the board is engraving cut your aluminum sheet into squares or whatever shape you want your buttons to be. Then when you put the buttons on the board make sure the sharp edges are covered up or sanded down so you don't or anyone who uses it doesn't cut themselves. after that solder some wires to the back of the aluminum and attach it to the capacitive touch sensor. Wire it to the Arduino and then map the buttons in the code (use a youtube tutorial). then you should have a complete capacitive touch sensor.