Export-oriented B2B manufacturing with multi-component products, biological raw-material variability and seasonal release cycles is conventionally organized as fragmented contract manufacturing that scatters design, engineering, production, quality control and logistics across independent contractors. Each handover leaks integration, and the burden of architectural decisions falls on a buyer who lacks cluster-side information. This paper presents a system-level overview of an alternative configuration — the one-window business architecture — developed by the author through years of operational practice in the Guangzhou bags and leather goods cluster, and applicable to the wider class of export-oriented B2B production it exemplifies. The system rests on five foundational properties: a single object of management (the collection), a single point of accountability, linear causal connectivity between phases, proactive governance through formal gate decisions (Gate 0 through Gate 6), and reproducibility as a configuration property rather than a stochastic outcome. Its anatomy is described across three levels — an architectural level of principles and decision criteria, a process level of phased lifecycle governance, and an executive level of suppliers, manufacturers and logistics operators. The paper develops six building blocks: the foundational properties, the three-level structure, the collection as object of management, the central control loop, the gate-based process structure, and the system boundaries. It then contrasts the architecture with the traditional OEM model and shows that predictability, reproducibility and margin stability emerge from the integrated configuration rather than from contractual specifications. The paper serves as the architectural reference for an intended series of companion papers.