Foregoing the storyline, as it's a DOOM-like game. It doesn't need a story, other than demons, big guns, and lots of firepower.
Well, after a while of trial and error, I managed to find this idea in 3 lines of code and 3 seconds. I had ideas before but I couldn't get the translucent look through the weapons, now I have. It looks real nice when you are running around, rather than a still picture.