The overall dimensions of the wall are 8' x 8'. Three separate 8-foot-long boxes were constructed using 3/4" poplar plywood with tempered hardboard backs. The boxes were stacked and attached to each other and the top box was anchored to the wall. Trim is 1"x2" and 1"x3" poplar.
We love it and use it ALL the time! As a former teacher, I have tons of children's books and I don't know why I hadn't thought to do this before.
Thanks so much for sharing, Anna!
(Images: Anna Roberts)