**FIRST BUILD: **Mind you, this particular documentation is rather small in comparison with my more recent builds. I have two others I have built. Ghostbusters Proton Pack Replica - Album on Imgur Be gentle, it was my first time building it and I rushed it for Halloween.
Of course, never complete without the gizmo. Ghostbusters Gizmo - Album on Imgur
SECOND BUILD This one I built with a larger budget than the last one. I had the money I got from selling the first one to use and boy did I use it. I took more time in planning the pack this time and as a result I think it came out way better. mk2 Ghostbusters proton pack - Album on Imgur However, there were definitely things I needed to improve on and I made note of that and addressed it in the third build I did.
THIRD BUILD Now this is where shit gets real. I believe I actually spent about the same on this one than I had the previous ones simply due to optimization. The problems I identified are outlined in a word doc somewhere in the album but I essentially wanted to make the pack more seamless and more rigid. http://imgur.com/a/O8sDi
This one is currently for sale, by the way 
Here’s a demo video of the sound capabilities Microsoft OneDrive
I do have plans for a future pack with smoke and all the bells and whistles, but I am currently still at school and working on the PKE Meter.
Feel free to shoot me any comments or questions! I love feedback on my work.