Proton Gauntlet (Arm Band) - Rhino
Building existing Ghostbuster equipment is fun, but designing your own equipment is better. Since this is a Constantine / Ghostbuster mash up, I wanted to take him into account. Since I don't think he would wear a 50 lb backpack and needs his hands free to cast spells, I went with an arm gauntlet design inspired by one of my favorite sci-fi weapons, Buzz Lightyear's arm laser.
I designed the upper arm component first because it seemed easier I had a pretty clear mental image of what I wanted to do.