Mine are square, but they are only a foot tall. Your measurements work, and thanks for the clarification on the double. My father-in-law built mine many years back when you could fish two pots, etc., so they have seen their fair share of use. Mine are only wire mesh with a 10 lb weight in the bottom, and I use two bait containers per pot, plus all of the empty cans of puss in boots. Your's sound like they are built hell for stout. It can't be any harder than pulling in a pot full of jellyfish in a 40 knot gale, though. Been there, done that.