While in the Negotiations level, you can get tricky mini kit. Use R2 to unlock the door into the room with the force fields and a mini kit piece on the spaceship in the Negotiations level. You must have Jar Jar Binks. Use the Force to stack up the boxes and use Anakin or Palpatine to jump through the vent. Press the button at the top, then use Jar Jar to jump up the other side to collect the mini kit.