I made a Pipboy! really happy with how it turned out , great model!
made my electronics with a 3v Pro Trinket, with a battery backpack connected to a 2200 mAh cylinder lithium ion battery ( https://www.adafruit.com/products/1781 ) the trinket and battery fit underneath the phone in the main area. I hot glued the LEDs on top of push buttons and wired it all up to the trinket with a ribbon cable, pushing the LED buttons will toggle them on and off individually.
The phone is a Samsung Galaxy S3, with a pipboy screenshot on it for the time being.