The real location in West Sussex has an integrated railway station and airport terminal, called the South Terminal. Part of this structure is positioned over the railway platforms and half of the north end of the building is being replicated on the layout.
Firstly, the roof shape was constructed using plain styrene sheet from Plastruct, with the square sections of roof tiles added, which are manufactured by Evergreen. The roof was then fixed to a Plastruct girder in front of transparent and black styrene sheet to give a window glazing effect. The photograph below shows a mock up of how the terminal roof will look in position.