1 Using the remainder of the sheet of ply, measure and mark a strip 350mm wide. Use the handsaw to cut off strip. You should have a piece of ply measuring 1200mm x 350mm.
Measure and mark this strip into 2 pieces: 900mm wide for the back and 300mm wide for the shelf.
Glue and screw the 2 pieces at a right angle, keeping the screws in line. Sand off all edges.
Position decorative hook/s as desired. Attach hook/s to shelf using wood glue.
You could use the hook to hang jewellery.