I love the fact that it sorts pretty much everything out for you. Notice how we've barely had anyone asking how to set it up having ignored every resource out there? God bless Valve.
One comment from me, I think the beams should fade sooner. The edges visibly meet the circle there, and the sharpness of the beams with the soft circles looks a little strange. Then again, did you only elevate Gordon for the screenshot?
That's a good question. I don't imagine so, but I couldn't swear to it. Test it ? use NULL from one of your WADs, and rename/move it away. Should work.
Incidentally, your account there is about to be removed for imitation. I'll get atom to leave dustbunny, but consider this your final warning. Imitation is not acceptable.
You mean the big yellow thingies? They're a model, and I'm pretty sure all their movement is done by their animation. Stick in a monster_generic and look for a likely model name, or have a flick through with Half-Life Model Viewer.