Using the shelf of the hide as a pattern, cut the base of the shelf. It is better to make it a little larger, and then remove the excess. This will help to perfectly drive it into place. Using the ruler, the holes are marked and cut out. But the holes are initially better to make a little more, and then fit in size. Then the second part is cut out of plywood from plywood and glue them together, carefully smearing the inner surfaces with carpentry glue. In places of fitting, shelves to the body should smear it with a macroflex. This will ensure the strength of fastening the shelf in the future.