ends of the central structure 12 will incorporate a dutch style door with 28 as the top door member 28 and bottom door member 30 the door members in the current best mode will operate independently both having separate locking capabilities also being able to interlock together working as a single door unit a means to translate the bottom wall panel 26 of the end wall panel assembly 20 from a first position out of line with the centerline of the top wall panel 24 to a secondary position inline with the centerline of the top wall panel 24 is provided to allow such separation this is done by translating the bottom wall panel 26 toward the interior of the central structure 12 and out of line with the top wall panel 24 to allow the endwall assembly 20 and attached central roof section 18 to collapse to the contracted position of fig1 for transport also provided is a means for cooperative registered engagement between the bottom edge of the top wall panel 24 and the top edge of the bottom wall panel 26 in the form of two or more beveled locating pins 82 extending from the top edge of the bottom wall panel to engage within an orifice 84 in bushings 86 located along the bottom edge of the top wall panel 24 the base of the central structure 12 provided here by the frame assembly 70 has four hydraulic.