An interior structure for a mobile platform is provided. The interior structure is constructed of a lightweight collapsible frame that can be reconfigured from a compact, substantially flat collapsed state to a non-compact, substantially sprawling expanded state. In the expanded state, the collapsible frame provides at least a portion of a structural load bearing frame for the interior structure. The interior structure additionally includes a plurality of interchangeable panels that attach to the collapsible frame to form interior surfaces of the structure. The panels form such things as the interior wall, ceiling and floor surfaces and can also include amenities such as shelves, lights, beds, closets, electrical outlets, Internet connections and entertainment equipment. The interior structure can be carried though the typical man-door of a mobile platform. Thus, the interior structure can be installed after the outer structure of the mobile platform has been assembled and just as easily be removed at a later time by merely removing the interchangeable panels, collapsing the collapsible frame and carrying the panels and frame out though the man-door.