A portable information handling system modular hybrid architecture separates components between rotationally coupled housing portions to minimize cabling, connectors and materials, and to provide improved durability that supports recycling and reuse of the components. For example, a plurality of display configurations couple to housing portions of different dimensions with opposing couplers and a common keystone element that, when installed, prevents separation of the opposing couplers. Removal of the keystone element provides ready access to the housing portion interior to recycle processing components, such as a main board having a processor and memory.