Inside the IMF Building. Drill the Wall with e.g. Emmet, build the Scan Disguise Device (not in video). Use the Scan Disguise on the guard to get into the laser blocked area to the right. Then use magic to rescue Benji Dunn.
For Minikit 7-9 you need to destroy the desks in the IMF building to build the track for the vending machine. Then push the vending machine forward. Use the Vent Access ability to get into the hidden room.
In there, destroy everything in the center area and use Master Build to get the Minikit