Yup one more vote to sell it or stash it as IMO it's far too valuable to use on a deck. However it's just my opinion and it's still a free country so if that's what your into...... Just remember to use some nice stainless steel railings to really top it off
As previously suggested 5/4 is more than adequate for the average deck though it is generally only about 1" finished dimension. I don't think most homeowners are too worried about 1000 lb bombs being dropped on their decks....or 1000lb anythings for that matter! And if they were, I think you would be hard pressed to provide any decking that would be sufficient short of maybe 16/4 thick Ipe
JeffD