Lightweight metallic shipping container

A lightweight metallic container comprising:

• two parallel elongated side walls each having a top rail at one side and each being secured on an opposite side to a corresponding bottom rail of a floor frame, each bottom rail being coupled to one another by a floor secured to and resting on a multiplicity of cross-beam members of the floor frame;
• a front end assembly secured to one end of each of the top rails and to one end of each of the bottom rails over respective corner castings;
• a door end assembly opposite the front end assembly and secured to an opposite end of each of the top rails and to an opposite end of each of the bottom side over respective corner castings, and
• a roof secured to respective ones of the top rails of each of the two side walls and comprising a multiplicity of horizontally continuous steel corrugated panels of a single uniform thickness of equal to or less than 1.6 mm in thickness,
• the floor comprising at least one metallic cellular sandwich panel formed by a frame defining an interior portion of the panel, the interior portion including a cellular core of a multiplicity of metallic polygonal cells, and a skin covering both the frame and the metallic cellular core.