Well....My group is just about finished with the Jewel of Yavin, and we got to the last section and not to leave spoilers...We came up w/ our own scenario and rolled really well! As a result, we are ending up w/ what the game did not intend.
So now our GM is trying to figure out how to end this thing...It is SOOO FUN!!!!
I purchased the adventure but haven't read it yet because my GM in another game is running it and we have yet to finish it. I'm not sure if we are still "on the rails" or not, but I LOVE this adventure. It's a darn good game.
If Cloud City isn't sinking in this new scenario of yours, you're doing it wrong. 
As I'm preparing to run this scenario I'd love to hear how your group went off the designed track and why it was so great! Just start the post with a spoiler warning 
yeah, you definitely can't tease this with having broken it and not tell us how you did it.
Move this to the GM section if necessary and post a massive SPOILER warning. But tell us what you're talking about. It could be useful to some of us GMs.
Ok I will post this in GM as well...But for the people here....SPOILER ALERT!!!
Ok...At the end of the heist, you transfer the funds to Arend and then you escape. In part 3 he goes after you...once we beat that foe, we decided to go find that fool and get our money. (Player knowledge vs PC knowledge) we were never supposed to get the money...
Now, we found out through our channels that he had a residences and a ship, and an office building...We went to the residence 1st...Not there...Then to the office...Not there...Finally went to his ship, opened it (Cuz we have a kick ass slicer) went to the main cabin and asked where he was, and failed our deception chk, so my PC stunned their asses, then we went to the Capt. quarters and knocked on the door, and made our deception roll for him to open the door...1 of our PCs said, "Shoot him in the face" so I did! He opened the door and I blasted 2 Stun bolts in his face. (The scenario in the book called for a great battle sequence w/ a chase scene, but because we made excellent rolls and w/ NO fault of our GM we went a different way that the book did not foresee, so we stunned him, tied him up and interrogated him. My PCs coercion chks were useless, but our "Talker" of the group made an opposed discipline chk, and w/ a Triumph we made him think we were going to Kill him if he didnt give us our money. So our GM having told us that we broke the game gave us a compromise...We got 1/2 the loot & his disruptor, and a promise that he wouldnt chase after us.
So after our minor chase scene, we escaped and got our credits...But as a parting gift, we all got some more Obligation.
So how did we break the game?? Well think of this game like a Bell Curve...There is a Median that when you play this game 100 times 80 of them will fall within the median, but 10 times will be a total failure of the system, and the other 10 times will be a "gifted" or some way that wasnt supposed to happen that way but because of great rolling and in no fault of the GM it falls in the PCs way more than is supposed to happen on paper. We were pretty happy about the outcome but now that we have 50pts more of Obligation as a group, we will have some major stuff coming our way the next time we play.
Oh so it is okay you stole the jewel AND took someones money at the same time?
The entire Cloud city wasn't going after your heads for that? nor impounding your ship?
I don't really think your broke it, just found a difficult way to get rid of the main antagonist, and got lucky several times
How our group broke JoY? Well, settle back kiddies and let me tell you a tale. . . .
First, we aced the Grand Prix and were quickly anointed the darlings of the city. Every stop at a bar had the drinks flowing and the party raging (encouraged where we could to be rowdy). Meanwhile we've got a secret numbered account set up on Arragau to transfer the stolen money to - no way were we going to let a stranger handle the credits. Any dividing of the shares were going to be under our control at all times.
And it was a tidy sum, too since we were able to get the bidding for the gem through the roof.
As for the heist, our plan was for our hacker to re-route the museum's outgoing calls, so that when our second teammate "break in" to steal the Jewel - purely as a distraction, intending for her to get caught - my character could intercept the call for the wing guard and stroll in dressed as security. So I caused all sorts of distractions, asking questions and examining the scene of the crime, basically keeping all the guard's eyes on me. Meanwhile two others slipped in the back way up the garbage chute all quiet like, taking out the one straggler I couldn't distract and grabbing the gem.
We have our run-in with Elaiza before the heist, not afterwards - and bring her on-board, cutting her in on the deal - so she supports the con and distraction job with the guards, allowing the two thieves to slip back into the party and drink their way to the ship. We never called Arend back, never gave him an opening to jump us and double cross us, slipping away clean as could be. . . .
So yeah, in short we pretty much scuttled act three of the game with careful planning. Mine you Arend is super pissed with us, but that's for future developments later. . . . .
Edited by DesslokDesslok, that's fantastic. I have a pretty clever and greedy group of PCs, and I hope to heaven they will come up with something half as crazy as your group did.