Those shelves....recently I saw a blog with pics of somebody's homeschool room....she had screwed rain gutters (horizontally) to the studs in the walls to make shelves. She had them all around the room. It looked really, really good and she was able to display many books. I don't know how sturdy gutters are; I was afraid they would be too flimsy especially for little boys to shelve their books daily
but she'd had them awhile and they looked to be in very good shape