Abstract: A base support apparatus includes a right and a left unit each of a rectangular, symmetrical configuration. Each unit has a front wall of a given length with extending side sections at each end. Each unit has a back wall of a shorter length with corresponding extending side sections at each end and extending towards the associated front wall. The corresponding side sections of the front and back walls are parallel and spaced apart to form slots or spaces for each unit which slots or spaces face each other. The units are separated by a desired width by means of cross tie members positioned between the back walls of the units. When assembled, the spaces provided accommodate sliding panels to close the ends of the base support units to provide a closed support base structure.