Build the two panels using the loose bricks in front of you. Go through the corridor and use the two lever on both sides of the door. Defeat a few waves of stormtroopers and follow the rest of the rebels. Use your grapple hook twice to get to the top level and use the bricks in there. A platform will appear, use it to reach the opposite end of the room.
Here comes Vader. You can't harm him now. Avoid the stormtroopers' fire and use four levers on both sides of the corridor, then destroy one of the containers that appeared near the Dark Jedi. Move further and defeat some more stormies. Open the window to the right to see the infamous Force Choke scene.
When you reach the dark room, move the two crates into the carvings on the floor. A few stormtroopers will come out of the door. Defeat them and join the droids inside. Switch to 3PO and use the panel on the wall. Now switch to R2 and use the next panel.
Switch to Antilles and use the crane (notice its arm's shadow to help you orientate) to get rid of all the stormies here. The rebel soldier will open a path for you. Let the droids go but stay in the crane - grab 3PO and move him to the door on the far end of the room. Switch to him and use the panel to open the door.
Defeat some more stormies and when you're further into the corridor, use the bricks on the floor to form a path for the droids. Do the same again a bit further and you'll eventually reach the escape pods. Switch to R2 and open the door to the left. Use the lever, again switch to R2 and open the center door. Defeat the bathing stormies and use the next lever. Now switch to 3PO and use the panel near the right door. Switch back to R2 and go through the right door, then activate the final panel.