Here's the mods I did:
Hollowed out helmet
Used Joe Trooper head (Will likely change to a comic pack Hawk head when I find my extra and paint the hair. That skin tone matches better to Mainframe but it's not too big a deal for now)
Modified vintage backpack to fit
Modified radio handpiece to attach to backpack
Swapped hands so he doesn't have the weirdly posed hands
Modified holster so now it is a functional one



pistol removed from holster


helmet off:

radio attached on backpack and hole on the radio used to attach


more pics




different lighting:

