A method of making an aircraft includes steps of: assembling a subfloor assembly, including a panel support and plurality of transport elements; coupling a wheel well assembly to an airframe of the aircraft to form a nose landing gear bay of the aircraft; forming a pressure boundary delimiting a pressurized space and a non-pressurized space with the wheel well assembly and the airframe; coupling the subfloor assembly to the wheel well assembly, in the pressurized space, to form a portion of a floor of the aircraft so that the plurality of transport elements is located between the panel support and the wheel well assembly; and coupling the plurality of transport elements to at least one high-level system of the aircraft.