In the blog post where I initially announced OpenGarage, I shared a Tinkercard link to the 3D enclosure:
Introducing OpenGarage: an Open-Source WiFi Garage Door Opener
That’s for the first version of OpenGarage. The current version is slightly modified, and we now use laser-cut acrylic enclosure. The laser-cut design is embedded in the EagleCAD files of the PCB, in the ‘Enclosure’ layer.