A blast structure and system for use as an outer blast protection component for a personnel cabin for a vehicle, is disclosed. The blast protection system comprises a personnel cabin adapted for receiving a blast structure, the cabin comprising a space forming an interior of the cabin, a floor within the interior of the cabin, the floor having a perimeter section and a removable floor panel centrally disposed therein, a blast structure comprising at least one outer blast panel attachable to the perimeter when the floor panel is removed, and means for attaching and detaching the blast panel to the perimeter section, providing an outer blast protection component to the interior space of the cabin. The attaching/detaching means include fasteners which are accessible through the interior of the cabin, without breaching the exterior surface of the blast structure.