Could consider having one 55 gallon drum as a float, in the center and strung to the cage structure. Use an open bottom and compressed air to raise and lower the cage, like a submarine, or link the floats you are using with air-lines and do the same thing, at each corner, far enough between top and bottom to get the raised height you need.
Never be afraid to try something new…
Remember, amateurs built the ark, professionals built the Titanic.
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