This is great! Would you mind sharing more about how you made it? For example, what size battery (has to be small to fit into the torso)? What size LED (I'm looking at one I have laying around and it seems way to big... must be different sizes)? How did you get the wire to run from the torso to the hand (I took a couple of minifigs apart and the arms do not seem to be hollow all the way through... and the hands are definitely not hollow).
Would love to try to make one if you don't mind letting us know how you did it. Thanks in advance for any help you are able to provide!