I am.

Have a look at the shivasubkiller cbani in FS1. You can see very clearly a cage-like structure on the side, glowing at the tip, that isn't present in the actual model.
You can see the same structure in the FS2 intro (when the beam charges up) and the FS1 ending movie (when the front half gets chopped off; you can actually see it on both sides).
So

intended the cagelike structure to be on the Lucifer, but for some reason it never got transferred onto the in-game model.
The cage-like structure, apparently, is supposed to be a beam emitter of the same type seen in FS2 (based on the FS2 intro and also on the fact that the weapon that nuked Vasuda looked like a beam).
In conclusion, go look at Vertigo1's diagram. I think he's got it all figured out.
