Instead of using glue or nails, I opted for screws, a wooden plank, and a metal bracket to create a sturdy, lasting structure. I attached a narrow wooden plank to the back of the tree layers, lining up the pieces largest to smallest. To avoid splitting the wood, I drilled pilot holes first and used a countersink bit to recess the screws. Once the screws were in place, I added a metal bracket at the bottom for extra stability and to secure it to a base later.