Stand your four buildings in place on the base following our floor plan. Before you stick them down, mark out where you would like to have the windows and doors. Windows would have been rectangular in shape with wooden frames and light green or blue glass. Doors were made from wooden boards, with two supporting planks added horizontally for extra strength. Draw or paint the windows and doors on the walls using a black pen to add detail. Now your buildings are ready, stick them to the main base. This should leave a large space in the middle of your buildings which will be your courtyard