12 of the unit 10 fig6 shows the modular unit 10 being opened the exterior roof panel section 23 is rotated out approximately 90 degrees away from the unit body two spring loaded dampers 41 as shown in fig6 assist in providing support to the roof section 23 the exterior portion of the top of the core section 11 and the exterior surface 12 of the roof section 23 are preferably covered with a roofing material or other material depending upon the use of the unit fig7 shows the continued opening of the roof section 23 which allows the combined floor 22 and exterior wall 21 sections to be rotated outward to a resting position upon the supporting floor beams 37 with the floor section 22 put into place the exterior wall section 21 is rotated vertically and the upper edge 61 interlocks with the exterior edge 62 of the roof section 23 the detail of the interconnection of edges 61 and 62 is seen in fig1 b additional interlocking can be accomplished with conventional locking mechanisms located along the exterior wall edge with the roof edge 62 affixed to the exterior wall edge 61 the side walls 24 can be folded out as shown in fig9 the edges 46 and 47 of which connect with the roof edge 48 and exterior wall edge 49 fig1 shows the expanded configuration of one side of the modular unit 10 and in fig1 the modular unit has been completely opened the roof exterior wall and side wall sections are insulated composite.