Even though I just completed the first case design for my Geogram ONE, I've already designed a new case with many improvements. The battery now has a form fitting pocket beneath the board so it doesn't shift under sudden moment, the circuit board is secured to the enclosure, the antenna is mounted internally (although the volume of the box only very slightly increased), and I included two pockets for magnets that will allow you to attach the enclosure to an object. I designed the new case in Solidworks, but re-oriented the .stl file for printing using Blender.
Above is a screenshot of my model in Blender. Below is the finished case with all the components installed before I seal in the electronics. I opted to spray paint the outside of the case black and laser cut a black acrylic panel for the front to make the unit more discreet for mounting in my car.
Here is the finished unit hidden away in my Miata. Personal Lowjack installed!