Awesome idea if a bedroom is against a hall closet! Never really use the entire hall closet anyway! Save on the clutter and fill uneeded space in the closet to be used for more floor space in the bedroom!
I love the idea of building the bed into the structure of the room for children's rooms. Beds are large pieces of furniture and take up space. This allows for more floor space. I would make the bed into a bunk bed for both Laura and Hannah!