Share Email Facebook Twitter LinkedIn Add More Elements to the Model After creating the preliminary layout, add more details to the building model to further develop the design. Topics in this section Stairs and Railings Create simple or complex stairs and railings in the building model. Rooms and Areas Use rooms, areas, and color schemes to plan occupancy and usage of a building. Components Add components such as furniture, casework, and plumbing fixtures to the building model. Parent topic: Build the Model