Yes this was very helpful. I agree 100% with what you said here. Though that missing box part was actually mean to be like that, so that the player can fly over with a box and do exactly what you did. The boxes physics thing has also bothered me too, which is why I made the boxes socket into the pressure switches so they don't bounce. That levitation glitch has been a long-lasting problem, and I thought I solved it so many times before double checking and finding out I was wrong...guess it even made it to the end!
Anyway, have a good week!