I updated the file after changing level 53. I had to redo the mechanism because of the tank glitch that prevents it from turning around properly. Now the green doors can be closed, but needs to be reopened in order to reach the finish. This gives the mechanism time to set up it's timing with the tank. It was one click off in the beginning which allowed the tank to go directly to the button and 'cook' the level.
I also realize that taking the chips would pose no threat while the green walls are closed.
I also realize that taking the chips would pose no threat while the green walls are closed.