Just started getting interested in a Beltway outfit myself and this thread definitely looks like it helps. To me, it seems like the best thing for the mask is to take this 3M Respirator...
Paint it black...cannibalize the mask posted above for the goggles...
I was thinking to hide the rest of the face, I could use either some more mask like rubber to hide the exposed faced or more simply, like a balaclava, though any ideas would help. This would then just take the Protec helmet like people were talking about and seem to have something close to his design.
The rest of the outfit would just be like a black pair of coveralls, pads, the tac vest that someone posted earlier, some gloves that would need customization, build the lower leg prosthetic, and then lots of belts lol What could be done about the bomb technician type collar and should parts? Also looking at the back of Beltway in a gameplay piece, he has something like...armor on his back? I guess I'll just have to wait and play the game to see more, but I'm not gonna build this right away, so I got time, heh.
Actually, I guess I could go with some black BDU's for the regular clothes. Makes more sense, heh.
*DOUBLE THE EDIT, DOUBLE THE FLAVOR*
And for the patch he uses, I just need to grab the RE:ORC special edition which comes with the specific patch he has on his arm which isn't just a regualr Umbrella patch. Quite handy.