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I would not go with schedule 40 steel pipe. Go to your local steel yard and get a piece on stainless pipe or aluminum pipe. Brass pipe would be the best. Steel pipe won't slide right. Also, you will want a long piece, you do not want any seams. After that, it needs to be anchored INTO the deck, drill into the deck if possible, if you can't I would go with a large plate, say 3x3, and lag it in to no end. For the top, that can get tricky. How far away is the grid of the space? Are you going to have a roofed set?