A pre-formed header assembly creates a rough wall opening for a metal door/frame, permitting completion of electrical, ducting, drywall, etc. prior to receiving/installing the door frame. The header is secured to first and second king studs at respective locations positioned beyond a desired door frame location. The header includes four different channels, one of which is utilized at two locations. The first channel has a first length to span between the king studs. The second channel has a second length, and the third channel a third length, which correspond to minimum dimensional requirements for completing the wall. The base of the second and third channels are each fixedly secured to the base of the first channel. The base of the fourth and fifth channels are fixedly secured to the first and second ends of the base of the first channel, respectively, substantially perpendicular thereto, for attachment to the king studs.

A window framing system for installation in a shipping container wall aperture, including a corrugation cap to cover a lower edge of the aperture and the adjacent corrugations, and the corrugation cap configured for supporting a lower portion of a window within the window framing system. The corrugation cap is a C-shaped channel with inner and/or outer downwardly-directed portions configured for positioning adjacent inner and/or outer surfaces of the wall, respectively. The system may also include a rain drip member mounted on an upper surface of the frame to receive water on an upper surface and redirect the water outwardly away from the wall. Tabs can be used to assemble the side frame members to the header and footer frame members, allowing assembly by a single person, and the tabs may further allow securing of the frame components using holes outside the container envelope for fasteners (thus reducing the risk of leakage inside the wall cavity).

A window framing system for installation in a shipping container wall aperture, including a corrugation cap to cover a lower edge of the aperture and the adjacent corrugations, and the corrugation cap configured for supporting a lower portion of a window within the window framing system. The corrugation cap is a C-shaped channel with inner and/or outer downwardly-directed portions configured for positioning adjacent inner and/or outer surfaces of the wall, respectively. The system may also include a rain drip member mounted on an upper surface of the frame to receive water on an upper surface and redirect the water outwardly away from the wall. Tabs can be used to assemble the side frame members to the header and footer frame members, allowing assembly by a single person, and the tabs may further allow securing of the frame components using holes outside the container envelope for fasteners (thus reducing the risk of leakage inside the wall cavity).