I am about to begin construction on a deck for my boat. Nothing special but a deck on the front, maybe 18-20 inches high. What metal would you recommend? I was looking at the Aluminum 6061-T6 because it's about half the weight of steel and from what I've read is pretty strong. It will be holding 3 guys that total up to close to 900 pounds.:jd: Any suggestions would be appreciated. Thanks