I built this coilgun last year when I stumbled upon a link to the CoilOsapien (a coilgun mounted on a robosapien!) on Hack a Day . That project inspired me to go about building my own modified version. I basically took the same circuit, beefed it up with some more flash capacitors, put it in a nice enclosure and hooked up some sweet old school charging/firing controls. Oh, I also made a modular barrel/coil connection so I could experiment with different coil and barrel combinations. If you want to see how to build your own coil gun, check out the Coil Gun v2.0 page. It has step by step instructions with pictures and videos.