Prepare the dado lay out for the sides, cutting no deeper than one-half way through the side pieces. The two dividers are edge lap joints at the center. Cut the center divider and the side divider no more than one-half way through the width of the two similar dividers. Prepare the center divider handle, as illustrated or with a curved or rounded over edge. The remaining material is removed from the handle hole with a chisel.
Trial fit all parts and adjust as necessary.
Remember to aim for a snug fit. Prepare the base from hardboard or plywood. Sand edges and faces smooth using 120 grit sandpaper. Glue and nail all the pieces together. Round over all the outside edges with sandpaper to avoid the possibility of slivers.