Boat building, one of the oldest branches of engineering, is concerned with constructing the hulls of boats and, for sailboats, the masts, spars and rigging.. A boat for everyone. boating is a hugely popular recreational activity in australia, with thousands of boats on the water every weekend. the following briefly. I believe in metal as the ultimate boat structure, and as a result i have created quite a number of metal boat designs. to review them, please see the sail boats.