I and a friend am currently working on a Thousand Sons army with green LED's inside to make them actually glow green, the colour of their souls possesing their armour. The model below is a prototype hence the clearly visible wires. Below is a tutorial for making them including less obvious wires. My friend [GrahamGilchrist] did most of the painting and I did most of the modelling, the head was a real **********.
This is the finished product:
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