This is the proton pack I built just a week or two ago. I used my shop at work and built it mostly from Sintra pvc board to conserve on the weight. It took me a total of about three concentrated days to build it. There are no working lights, as I didn't want to add the extra weight of batteries. I built it from the available on-line plans (both the sets available and I fudged to make them co-operate). I also found a suitable replacement for the gun mount clip (see images). These clips are available from Grainger and are VERY cheap. I didn't have access to alot of the original found-parts, so I had to make replicas of them from whatever source material I could find.