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3) Design a tube & coupler scaffold with schedule 40 standard steel tubes to carry the load of a heavy-duty construction operation with the following features: 4 levels of scaffolding Each level is 8-ft tall Transverse width is 7-ft wide Posts are spaced 7-ft O.C. (direction of the runners) Various sizes of select structural Doug-fir Larch dimensional lumber are available in your inventory Clearly determine the following (show associated design process and calculations): The nominal dimension of the wood plank (ensure the size reflects minimum labor efforts on site) The nominal size of the bearers, runners, and posts