A factory for assembling aircraft or other systems includes a factory floor with multiple build stations. The factory floor includes a hub-and-spoke tool track having radial track sections connected to and extending radially from a circular center hub section. Each track section terminates at a respective build station. A mobile transport travels along the track to the build stations, transforms into different join tools at a predetermined build station, and thereafter engages and supports the components. An overhead crane may perform another task at each build station. The factory floor may include a first floor positioned below a smaller diameter second floor with ramps interconnecting the floors. A center tower is surrounded by the floor(s), with the center tower defining rooms. An aircraft may be assembled via a method using the above-noted factory.