The physical architecture of an AI factory is beginning to take shape long before construction equipment reaches the site. Its electrical distribution, cooling topology, equipment interfaces, structural requirements, and operational sequences increasingly emerge from engineering environments where designers can assemble, inspect, and validate complete systems before transporting them to their final location. The shift becomes particularly important as AI infrastructure brings together high-density computing, liquid cooling, power conversion, heat rejection, and control systems that require coordinated engineering across multiple disciplines before installation. The emerging industrialised model therefore places engineering repeatability, interface control, and system validation at the center of the development process rather than treating them as activities that follow conventional construction.