Remove the drawer's hardware, such as the handle and any other parts that you do not want on your shadow box, using the screwdriver.
Measure the length and width and depth of the inside of the drawer with the measuring tape. Make notes of these measurements. Plan a layout for where you want your shelves to be in your shadow box. Measure for your layout. You need these measurements for when you cut the wood.
Cut the planks of wood into the appropriate shapes that you measured for. Wear safety goggles when cutting the wood with the saw. Sand the edges of the cut wood planks.
Fit the planks into your drawer as you planned in your layout. See if they fit nicely. Once you have everything as you want it, it's time to use the wood glue and glue all the planks into place. Let the wood glue dry for several hours.
Attach the wall hangers on the back of the drawer shadow box on both corners at the top. Make sure the hangers are strong enough to hold the drawer shadow box. Hang it on a wall and decorate it.