From the plan view of the designer's lines, import the plan view curves that represent the intersection of the deckhouse and the main deck. These will be found on layer cDeckHouse1. Extrude these lines to a point just above the boat deck to form the house sides for the first level of superstructure. Trim the resulting surfaces to the main deck and boat deck. Repeat this process for the second level of superstructure (the Pilothouse and Master's Stateroom).