This version of Adafruit's Spaceship Earth accommodates common 6x3mm magnets and adds the proper depth to the tabs so you can press-fit them in with some needle nose pliers. If you prefer not using tools, there's an optional 6.2mm model you can print and use CA glue to secure the magnets.
There isn't really a need to use the more expensive USB type C breakout connector. All you're using it for is 5v power. I've added a modified bottom cover with a snap fit to save cost on screws if you use the one in the BoM above.
Added two additional stl files with a 6.2mm magnet diameter for a looser fit in case your magnets were manufactured with a larger than 6.00mm diameter.
Added a modification to the sphere cover to snap fit this micro USB breakout board in BoM above.
Here is a link to the original Adafruit model: https://www.printables.com/model/482760-epcot-spaceship-earth