Required Character: Jar Jar or Darth Maul
Death Star Plan 1: At the lowest part of this area. Sitting on the ground near the force field.
Death Star Plan 2: Unmissable, literally sitting on one of the steps going down after going past the force field.
Death Star Plan 3 (Jar Jar): After getting the second plan, use the force on the switch on the slightly higher platform. It'll deactivate the force field above. If you jump at it you can get it by simply touching it slightly.
Death Star Plan 4: Sitting on the path above in the second part, near the secret room.
Death Star Plan 5: Then go into the secret room to grab the plan sitting directly in the middle.
Revealed Code: Start, Start, Right, Down, Right, Down, Left, Up.