I have a new (longer) dock that is now over deeper water (up to 30+ ft at full pool) that I am wanting to add structure to. We use to put out christmas trees, but now that I have found out about PVC I have been thinking about a "hanging" structure. What do ya'll think about a 4" tube 5 feet long with 1" "limbs" in a tree shape hanging under the dock about 10 feet below the dock? Anyone else ever do this? Any other suggestions?