DIY Stair shelf for the loft bed | Using 1 plywood only

Size: length : 60 inches height: 56 inches width: 12 inches Materials 4 x 8 x 3/4 inches Marine Plywood wood glue nails plazolux glazzing putty sandpaper Quick Dry Enamel - White DIY Stair shelf for the loft bed | Using 1 plywood only