To make the set up with ROM/fX and troopercom a little more snug, I made tubes of lycra with velcro on the back and a zipper in the front. Inside the tube, I just tucked all the boards, wires, batteries and chaos. Then I put a line of velcro inside the tubes in my helmet.
Two tubes with ROM/FX, troopercom, batteries and wires. One open, one closed.
Just connect the mini-jacks to the speakers, microphone and magnet switch in the helmet.
Tada! Tuck the tube inside the helmet, and you're good to go!