I found the wood for this medium sized bookcase at a local thrift store. I was a very primitive, large cupboard in heart pine that looked like it had been stored in a barn for decades. What drew me to it were the wide planks and worm holes in the wood which gave it amazing character. Unfortunately, I didn't have enough to create the back paneling. There I used 3/8" thick, pine, v-joint paneling and painted it to give an aged effect.