My brother (who was the driving force behind my Robo-Roach) loves Iron Man. So, I decided to make the lil guy a chest arc reactor. I found a model of one on Thingiverse, and I followed it to a point, but I ended up needing to make my own parts to make it really work. This project went from idea to completion in two days and it was too much fun to keep to myself. There are no specific build instructions per-se, but the build log pretty much tells the tale.
Links to my custom designed parts and the original arc reactor model itself can be found in the links section.