I wanted to use all of my players' characters backgrounds to form a campaign that culminates in a final epic battle where they are all finally absolved of their obligation. I've decided to ignore the obvious railroading problems that may come up with starting with the beginning and end first.
The players are:
An ex-imperial turned bounty hunter after getting kicked out of the ISB for investigating a little too deeply into the suspected treason of a Compnor select committee member. He ends up finding a secret cloning facility at the committee member's home and is captured, tortured, and relieved of duty. He turns to bounty hunting at the suggestion of his wife, an ex-smuggler, ends up botching a job, and ends up in debt. His wife is kidnapped and sold into slavery to pay for this debt and he now bounty hunts to buy her freedom.
A Bothan pilot from a prominent family on an outer rim planet has a rebel for a brother. The brother holds secret meetings for rebel symmpathizers and soon takes action against the empire in the form of the bombing of an imperial munitions depot. Brother runs off to join the rebellion in earnest. His family soons receives word that he has been captured. The family is disgraced and excommunicated. Soon the imperials send bounty hunters after them as well. The father sacrifices himself to save the mother and our pilot hero who has made it his business to make trouble for the empire by smuggling.
A big game hunter is wrongfully accused of murdering his friend. In reality his friend was murdered by a different mutual friend but the only person to believe he is innocent is the victim's sister. Our hunter flees his home planet until such a day that his friend's sister can prove his innocence.
A slicer gets duped into a dangerous job by another slicer. In an effort to infiltrate Black Sun a smaller crime syndicate has setup a test for our resident slicer. Under the guise of testing his organization's computer security, the agent of the smaller crime syndicate tricks our slicer into infiltrating Black Sun, who promptly trace the slice job back to our PC. Instead of conventional punishment Black Sun wants the slicer to gather information for them.
How the party meets:
The slicer in attempts to appease Black Sun joins with our Bothan smuggler pilot who has done a few jobs for Black Sun himself and may know a few places for our slicer to start his search for information. The pilot also used to work with the bounty hunter PC's wife. The bounty hunter makes friends with the big game hunter on a visit to see his enslaved wife. The big game hunter is a trophy hunter for the Hutt holding the bounty hunter's wife.
The plot:
The Compnor Select Committee member is actually a spy for the rebellion, which would explain why he didn't want an ISB agent snooping around. His mission is to steal the cloning technology used to create the Spaarti clone stormtroopers that supplemented the orginal Fett clone troopers, and use it to create a clone army for the rebels. And who should he select to provide the flash memories of the clones? Why, none other than a fanatic young Bothan who took it upon himself to create a militia and bomb an imperial munitions depot. Who wouldn't want to see that kind of dedication in a clone soldier? So the committee spy stages the brother Bothan's capture to throw off the imperials and give the brother access to the cloning facility. Unfortunately this does nothing to deter the empire from pursuing his family.
Speaking of which, after one of her sons is captured and the other turns to smuggling, momma Bothan decides to start where her son left off and start an underground movement against the empire. She adopts a new name and after sharing her stories, quickly becomes a figurehead and leader of the new movement.
Now as destiny would have it, the sister of our murder victim fighting to prove the big game hunter's innocence, is force sensitive. She regularly communicates with the hunter and updates him on her progress. As her investigation brings her closer to her brother's killer, the murderer discovers she is a force user and turns her over to the empire. Vader takes a special interest in her because she is a Togruta (Anakin Skywalker's Padawan just also happened to be a Togruta) Vader and the Emperor turn her to the dark side and she is employed as Vader's personal private investigator. Her first cases? To follow up on an investigation of treason that seems to have gone cold, and to look into a bombing of an imperial munitions depot, naturally.
She discovers the Bothan brother's role in the depot bombing and seeks him out. She catches up with him (after he helps make a bunch of rebel clones) and decides his fanaticism, could it be redirected, could be made to serve the empire. While contemplating how to turn her newly captured Bothan rebel to the empire she moves on to her next case where she quickly discovers the name of the last ISB agent in the treason investigation and recognizes it as belonging to a bounty hunter friend of her big game hunter buddy. She learns the situation surrounding the bounty hunter's wife and decides to use her as bait to find out more about the secret facility he suspects rests in the confines of the committee member's home.
The Bothan brother eventually gives in to the force user investigator's deception and spills the beans on the rebel plans to create a clone army but cannot give a location because he was bound and blindfolded to make his "capture" more convincing to any doubters. For his service Bothan brother is given the task of leading an assault on a militant uprising in the outer rim. (Which unknown to him is led by his mother)
The slicer is secretly entitled to a large sum of money which was to be inherited after a family member's lucky day at the wheel. The following day was not so lucky when the loser of the large sum took the life of the winner. The wheel's administrator was "convinced" to pay the empire fees, tariffs, and taxes equal to the winnings to keep the wheel free of imperial presence. Why did the empire need even more money than usual? To make a deal on disruptor bombs from Prince Xizor of Black Sun. However in a plot to play the rebels and empire against each other Xizor has made the same deal with the rebels with plans to use the disruptor bombs against both factions.
The final battle:
The rebellion, with their new clone army rush to the aid of the uprising hoping to make a valuable alliance and obtain secret weapons from Black Sun
The empire looks to crush the uprising and the new rebel clones.
Black Sun uses momma Bothan's uprising as an opportunity to get the rebellion and empire in one location. The rebels will need to arm their new clone army with disruptor bombs to assist with the defense of a rebel ally, and the empire will need the bombs to stifle their opposition. Black Sun has no intention of selling their bombs, but rather wish to use them to cripple the rebellion and the empire.
The force sensitive investigator lures the bounty hunter to the final battle by offering an exchange: His wife for the location of the rebel cloning facility. She also happens to have the evidence to clear the big game hunter of any wrong doing concerning her brother's murder. The slicer will want to claim his fortune which he finds out the empire has brought with them and the pilot will be lured there by discovering the news either about his brother or his mother.
Ultimately I envision this huge battle with the PCs all emotionally invested. Does the Bothan pilot help his brother kill his mother or the other way around? Does the bounty hunter sell out to save his wife? Can the slicer get his credits and still escape with his life? Does the big game hunter get the evidence he needs to prove his freedom?
Any help with filling the gaps between the PCs meeting and this final battle would be much appreciated. Not sure how to accomplish it without assuming my PCs will side with the Rebellion and without railroading them too bad. Thanks for reading.