Hi, here is my version for the main components of a Ghostbusters Proton Pack. I modeled it in SolidWorks from Pictures and with a lot of help from the GBFans.com Forum. There I´m METATRON. So it´s 90% movie accurate, I would say :) We did build some Packs with it.
For the L.C. 2 Alice Pack Frame and the Bellow, see my other model posts. The R-331 from Clippard Instrument Laboratory Parts is in it, too. Together and all parts in a separate file.