SRS, Those cubbies look wonderful! Does your daughter actually put everything in place in them, or do you have to do some of the tidying?
My closet shelves are free standing. Bolting supports to the wall isn't an option. I did add a cross member to the middle of each shelf with the thought that I could add another leg there for added support if needed. So far they don't seem to need any support other than the legs at either end.
Over the years I've built whatever was needed and a few items to amuse and occupy various children. Sometime it might be fun to try to locate old photos, scan and compile a visual record. It's easy to forget ones accomplishments.
The task at hand, however, is to try to get the home dusted and tidy before midnight if I can get pain under control and sleep a little.