Here's a box to keep your spare hotends for the Flashforge Adventurer 5M and 5 Pro in. It's got little cubbies for the replacement nozzles that you can get for the upgraded hotend, with compliant Keepers to retain them. I originally went with magnets since the nozzles I have are all hardened steel, but realized that others may have the brass and stainless ones too.

To facilitate different arrangements of components, I went with moveable "flags" that you can add text to in the slicer to label your particular setup.