As I promised, here's the little story I wrought for the B'day of our beloved Queen
Serious though, I took as many things from the "Battuta interviews Volition" thread as possible; and the result is different from any (released) campaign I know of. It might be not everybodys darling, but I like it
FS2 Expansion - <insert random Sol war here>
Beginns with a training - how TAG weapons altered dogfighting entirely, how to fly a remotely controlled meson missiles the size of a fighter etc.
The GTVEA encounters the Ancients while exploring the regions beyond Altair. They survived the downfall of the Ancient Empire; for they are remains of the sublight Empire of the Ancients - 8.000 years ago they were just a small colony that wasn't linked with the main part via Knossos (the reason they built this was to access/connect all pre-subspace colonies), but have grown over time.
Due to having found out what happend with their brothers and sisters, they decide to join the GTVEA, which is then recalled "Grand Alliance". However, not all of them want that and a minor rebellion breaks out, carried by people who are worried about their autonomy, their culture etc. While putting down the rebellion the Alliance shows some negative sides - it has become an institution that follows its own interest, and not necessary common sense (corruption?); the idealism of the founder generation is lost and while the races have lost direct power they compete for influence in the Alliance, which is mostly being held together by being without alternative (like current EU).
When they discover a route that leads to Capella and Shivan ships show up, the Alliance decides to overcome its internal problems by going into the offense. A gigantic fleet is assembled, the Shivan defenses gets crushed, and the Alliance enters the center of the Capella nebula. Travelling through the Super-Node - the journey takes far longer than any recorded jump in history - the Allied fleet reaches the Shivan homesystem. Near the node (maybe 100km off or so), they discover a giant space station (like the SI Hara, maybe larger). Believing this to be the center of all Shivan activity, the GA attacks it.
Meanwhile, a very small exploration force enters the orbit of the systems' red dwarf in order to investigate the stars strange spectral lines (it is also covered by a dust cloud from the initial arrival point). And they find out the reason - a Shivan Dyson Grid around the sun, consisting of hundred thousands/millions of these giant space stations that they just try to blow up. The Alliance is completely shocked, some suggest to withdraw before the Shivans "get angry".
Instead, the Alliance goes into the offense, attacking furiously the Dyson Grid. While the propaganda is optimistic, most question the sense behind this. The player can choose here after its first homeship got destroyed (branching mission structure instead of the loop missions of FS1 and FS2) - join a specially prepared ship, protect it against Shivan assaults while scanning the empty space between the filaments of the grid in order to monitor the Shivan activity while other ships attack them (a seemingly useless task) - OR - the player can join the attack force (fly super bombs, scanning for weakpoints etc).
Eventually, the Alliance is able to deal much more damage than anybody would've expected; taking advantage of orbits, the debris of destroyed parts of the Dyson Grid causes further damage and so on. In the end, however, only 1/10.000 or 1/100.000 of the grid is destroyed, at the price of 1/3 of the allied fleet.
Then, the worst fears become true - a huge part of the Grid (something from 500km to 3000km) breaks loose and starts heading for the Shivantown-Capella supernode. In panic, the GA tries to seal the node with multiple Nodebusters, but since the node was actually formed by a supernova, it is far too strong to collapse by such small explosions. The node ulitmatly collapses under the transit of the giant Shivan ship - but only after it already left subspace.
The Hive travels through GA space, collapsing some nodes until reaching the "lower group" of GTVA (Laramis/Luyten etc, which hasn't been explained much by Volition so far). Like the Sathanas armada, it ignores GA mostly, yet the huge accompanying fleet wreaks havoc. Once it reaches a red dwarf in the group, it destroys one of the planets in orbit (one of the densiest populated planets of the entire Alliance) with its subspace weapon, killing hundreds of millions of people. An act of pure evil.
Since the Hive can't be destroyed, the Alliance starts to deal with the rest of the Armada first. Turns out, the destroyer in the scanning mission was equipped with a special ETAK device. Due to the scanning of the comm-nodes of the Dyson Grid, the GA has created a tool that predicts Shivan behavior and detects their ships at long-range, giving them a huge advantage. GA not only evades Shivan traps, but is able to set them on its own, and eventually calculate the reaction of the enemy. The ratio of destroyed ships shifts in favor of the GA, and despite the vast numerical superiority of the Shivans, the GA has now the upper hand against them. Throughout the entire time, not a single Sathanas or Lucifer is sightened, for they are specific ships (head of exploration-elimination task forces, construction of galactic nodes).
Finally, the motives of the Hive become apparent. Deploying countless construction machines near the exposed core of the destroyed planet, the ship starts to construct a Dyson Grid, similar to the one in Shivantown, right in the middle of GA space.
After most of the Shivan fleet has been destroyed, the remaining 40% of GAs fleet gather to attack the Hive. They are able to destroy most of the facilities specialized for warship production, but the much larger "civillian" bays can't be destroyed, for they are simply too huge. Despite the fleet being down to 20% now, the GA has bought time again.
The End: The key to fight the Shivans now is to maintain/improve the Alliance; military wise by developing better technology, for the Shivans now have less sophisticated technology (minus supernovas). While GA realizes that the Shivans can never be truly defeated for they rule atleast the galaxy, they don't have to worry about the main Shivan Dyson Grid anymore that send them the Lucifer and the Sathanas armada. Yet, they are more threatend than ever by the one in construction right next to them, but they learned how to damage the Grid, the fleet and the Hive once in a while to prevent it from becoming strong enough to annihilate GA. Also, there's further speculation about the Shivans and the reason for their actions - apparently having been created once by somebody, they try to survive the universe' heat death by spreading to the longest living red dwarfs in order to have as many chances as possible, etc.
What I couldn't fit in was the thing with the FS2 nebula system as it's implied that it's the result of another Shivan supernova. Probably this might fall in the same category as the question "Which route would the Shivans have taken to Capella if the NTF hadn't opened them the 3 Knossos portals?", what is also not explained...
I don't know about the middlepart, with GA attacking instead of running away, but I thought it'd be more interesting that way.
Thoughts anybody? Feedback is welcome, positive or otherwise.