Go back to the targets and look around. I only remember that it needs blowing up with two boxes either side of it. And on the level in Hoth, where you have to escape from the base with Han, Leia and C-3P0, what do you do when there's the door with 'mesh' over, a cannon to be build, a train thing on the right (which you send down the corridor to the room on the left to blow the door open) and the room on the left with four buttons on the floor?
I just finished the last level. The Death Star II is just the image from S@H minus the stand and laser. -_- At the start you have to torpedo down four or five playset-style ISDs.