I want to build two free standing triple deck stands for 30 longs. These would each be about 72 inches tall, 13 inches deep or wide and 37 inches long (trying to go for a half inch of space at either end). Was thinking about building it with two by fours, maybe with eight polls (two on each side) for additional support. Wondering if you guys think this will work. In doing searches I'm not find too many plans for triple deck stands that are free standing.