Assuming 4 - 16d (2 on each side) nails on each "step" in that device. 4 x 93 = 372 pounds, With a support on each side, that is 744 pounds total. The beam is not nearly that heavy, they have a pretty large safety margin.
As far as making ladders, I do some mission work in the Caribbean, they make ladders from some of the scariest things.
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