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I think you'll find the biggest factor is the footing(s) along the outside edge of the structure. From your description, the ground is about 10 - 12 feet below the deck level at the outer edge and you don't say if it levels off or contunues to drop past that point. Is it undisturbed soil or fill which was left there from the excavation? Once you've got that figured out and the general structure of the deck itself, (one level or two, straight lines or varied perimeter, stairs to ground, etc.) its a matter of a materials list and a calculator.
Better take Trekkor up on his offer.
Les
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Les
My train of thought has been replaced by a bumper car.
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