That works great! Thanks JeffMOD!
A new issue has presented itself, however. The combine generator prefab (yes I know its a prefab! Shock, horror! Im new to source; sue me!) allows combine energy balls to be punted out of it, but it doesn't like them being inserted (snigger balls being inserted (just thought i'd beat you all to that one)).
Any solutions?
EDIT
Problem fixed, I fiddled with the physics_trap and the generators being very polite now.
My entry is almost complete (I've benefitted from a week off of college, and one coming up soon as well (UK got pwned by sudden snowfall)) I just need to make the main generator room look nicer now.
EDIT II
Shot at 2009-02-08
The generator has been updated. That damn panel STILL wont illuminate.
It's almost done one prop near the bottom didnt render, so I need to fix that. Almost ready to submit. (Also that black line that seems to emerge from the Grav Gun isnt shoddy map work, it is infact a cable).