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Per OP, the total wall length is 16' 6" (including another stack of beds to left of stairs). Assuming standard Twin-size mattresses, bed berths are approx 6' 5" long, walls/posts are likely 2x6 construction (so 6 1/2" thick), which would leave around 31" for the ladder -- give or take a few inches. Depth of berths is probably around 3' 6". Ceiling height appears to be 10 ft.