I like how the beds are at right angles so no one gets stepped on when the back bed person gets out of bed. Spinning wheels on foot of trundle and a pole pinning it underneath the larger bed it can swing out on. Like a jack knife blade motion.
DIY platform bed. I'm thinking this would be cute to do on a twin-size scale for the girls. A bookshelf to hold all their picture books, then under-the-bed storage space against the wall to hold bins of their old clothes/clothes they haven't grown into.