It's a remix of http://www.thingiverse.com/thing:786884. I have scaled it to the 80%. The instruction and the part that you need is the same of the original thing. You just need some M3x12 screws and nuts (not the M4 such as the original). I have also added four internal led, who are controlled by the power switch in front. Connect the power of the led to the general power. You need to make holes on the lid to insert the LEDs. I have used four 3 volts LEDs. Enlarge the cropped photo to see the full foto.