You might want to try railroad ties, staked with steel rods. I built
one at my old house like that but my drop was only 15 feet.
Definitely permanent, relatively waterproof, and all you need is a
chainsaw, a sledge hammer, HD drill, and big auger bit(and plenty of
time and muscle). Three ties deep, stack the second set of three
starting on the last tie, pin it with the steel rod, double stack the
base and pin everything, vertical on the nesting tie, and horizontally
on all three. The steps are two (2) ties wide. You can probably
build a handrail using pressure-treated 2X4's. If possible, terrace
the steps so you don't have a straight run which can be awful
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