If you want to get this accurate, remember that never did the GTVA try to land forces on the Sathanas, simply because it wasn't feasable. First off, you'd have to disable and disarm it, then get it to a safe place so you aren't overrun by Shivan forces. Then, after you've cut through the hull, which by the way, will take a long long time, you are gonna be outnumbered by technologically and physically superior forces in a strong defensive position. So that would be why then

I reckon that the missions in the game actually gave enough scope for a few missions, plus a few user made... like, here's an idea, being an undercover operative on the Iceni when the Shivans attack it.
If u need a hand, I'll help, although I've said this to all together too many people recently, I think this would be a kick arse mod. And it'll give me the experience I need to create a Fallout mod

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"Supernova, ya supernova, supernova goes pop
supernova, ya think it's over but the supernova don't stop" PM5K
Death:"Arnold Judas Rimmer... your life is over. You will travel with me to the-"
#knees death in the groin#
Rimmer:"Remember matey, it's only the good that die young"
Kudoth, god of pointless educational programs.