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!
Kid's built-in bed/nook with storage below
Double Loft Bed for Adults Space Saving Ideas with Adult Loft Beds- Loft beds are excellent house saving ideas for small rooms. Lofts with low beds and loft