Add the power circuit to the dimmer. Then add the sound trigger on. On top of that add servo hub to the servo and add servo.
Add servo mount on and then add the mechanical arm.
Add your wond to the arm and tape it on. (Mail/Clear tape works the best.)
Add shoes on everything except the servos fan.
Find a place to hide your wond. When someone makes noise close to the sound trigger your wand will go off.