Between the

Now, using dowels, the frame is fixed to the floor, and with the help of specialized fasteners — to the wall surface. Plywood sheets are attached to the base of the frame (it will be the lower shelf), and to the top of the frame on the screws, we plant a thoroughly trimmed sheet of fiberboard, which serves as a layer from the bottom of the countertop. We put two rectangular plywood sheets on partitions between the compartments in the middle of the structure. Then another 1 sheet of fiberboard is laid on the countertop with the upper layer and sheathe the entire system on the sides of the plywood sheets