A similar kind of shelf that is becoming common is to use rain gutter to make shelves with pieces of it screwed to the wall.

I only have the board books out all the time with the other kind of book available to a select few kids and done at the table.

Pick up books at garage sales so you don't feel so bad when a 25 cent book gets ripped. Right now my teething toddlers have decided books are for chewing so they have been removed. We do not put books in our mouth period even if you are a baby.