The bigger the better. In fact, since you are already making it-you might as well make it multi-functional. A bookcase. A room divider. A storage barn. Hey~you could make it the size of a wall for an easy repair if ever, say, a car were to drive through your living room and left a huge hole.
Make sure the boards are standing up straight. If necessary, nail, unnail and renail for complete accuracy.
Take care of all sharp ends, unless your child needs a finger amputated and you don't want to pay the hospital bills...
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