On the left edge of the left-hand panel, cut an uneven edge like the one shown using a jigsaw. Remove between 1/2-in to 1-1/4-in of wood. Using a torch, carefully singe the side of the uneven edge. Then singe the remaining edges on all three panels.
Good to Know
When burning the plywood using both the torch and woodburning tool, work in a well-ventilated area that carries the smoke and fumes away from you. Keep a damp cloth handy in case the flame lingers too long in any one place and the wood starts to burn on its own.