I'm glad you were able to overcome your writer's block--at least temporarily.
My only complaint (which could be considered a fairly big one) is that the dialogue before they arrive at the prison is really clumsy and unnatural. You've had a lot of good dialogue before, but this time it feels too much like the style of the narrative rather than dialogue. Star Wars dialogue in the OT tends to be similarly clumsy or unnaturally wordy like that in places, especially when Leia is speaking, but I think you could improve the flow of it at least a little more.
Looking over it a second time, I think a big problem with it is that you fall into "as you know..." type of dialogue, having Siri and Ben explain things which they would both already know.
Here's a slightly revised version of that dialogue, just to give you a better idea of what in particular seems awkward to me (it isn't the best either, but hopefully it helps):
SIRI: (smirking) Impossible to tell without knowing more about the environment and terrain of this place. What little we saw of the spaceport when we were unloaded isn't enough for us to figure out where we are. For all we know, we're deep inside the Unknown Regions.to indicate where in the galaxy we are. We could be deep inside the Unknown Regions, far from any charted system.
OBI-WAN: (regarding the walls of the transport) They've incorporated Mandalorian iron into the walls of the transport.
SIRI: Looks like [a]n alloy with Mandalorian iron as a component, I'd wager. Not as strong as the pure stuff, but still incredibly strong.
OBI-WAN: That makes it a bit more difficult to escape. Making a conventional breakout unfeasible.
SIRI: The framework is probably the same way also laced with Mandalorian iron, making the armour even stronger.
OBI-WAN: But if we -- the two of us along with the other prisoners -- could establish a rapport, pool our collective power in the Force --
SIRI: (shaking her head) It's not going to happen. Were everyone aboard a fully trained adept, it'd be possible, but most of the prisoners are too inexperienced, untrained, undisciplined. And [t]here simply isn't enough time to teach them how to coordinate their hearts and minds for such an effort.
OBI-WAN: (sighing) I suppose it wouldn't be an advisable course of action, anyway, without knowing more about the world outside. The air could very well be toxic and unbreathable, or there could be intense radiation. filled with deadly corrosives, toxins, or contagions. The surface could be bathed in intense radiation or teeming with extraordinarily vicious creatures. We could be flying high in the sky, or diving deep under an ocean. Breaching the walls of this transport could mean certain death.
SIRI: All melodrama aside, you're correct. (beat) Even if we were to make a clean getaway, there's no guarantee the Mandalorians wouldn't be able to track us all down and round us all back up.
OBI-WAN: This is their home ground, they have the advantage. (beat) Perhaps our horizons will broaden once we reach our destination.