I just did this level now and found an exploit. When you are in the room with various cubes look over to the gun on the right, (the two outside this room). Place a portal behind this turret and then the other portal below the cubes. I don’t know how it worked or if it works again but in my game the cubes can go through the cages that the turrets are in and know them down. However, alot of the cubes just vanished through the floor so I started picking the turrets to know down the rest of the turrets in the cages. For some reason all objects can pass through the floor and walls so be careful not to lose them.