Chapter 8: Starkiller Sabotage - Starkiller Shield Room
Of the last four kits, only one is accessible in the story mode, so be sure to swing through again for the other three.
Minikit #1 - Free Play Mode
Use the force on the tank at the back of the room at the start of this area.
You'll get parts for the first minikit.
Minikit #2 - Free Play Mode
Head up the stairs and over to the left. Destroy the objects here for parts.
Reassemble them into a BB-8 platform and hop on.
You'll be launched up to the ledge where you can pick up the minikit.
Both during and after the shootout, you'll spot a number of small droids whizzing around. Shoot four of them for the minikit.
Minikit #4 - Free Play Mode
To the right of the corridor where the shootout takes place, you can use the force to open up a door.
Nip through to pick up the minikit.