Dark Matter (Apple TV+) Multiversal Travel Box - Hollow Inside, Two Parts

I wanted a miniature display of the multiversal travel box from the Apple TV+ show, "Dark Matter" and couldn't find one, so I decided to make my own in Blender. I separated it in two halves, leaving a spherical hollow space between them with pin holes and pins to put them together. The main reason to hollow it was to save material but this space could be used to hide things inside of it or add some weight to make it more of a paperweight. I did not have any black filament left, so I painted it with obsidian metallic acrylic paint. I suppose you could use putty to hide the creases and paint over it.