How the 4.2-inch enclosure is built, feature by feature: every sketch appears on the body it is drawn on, then the pad or pocket it produces. Bezel first, lying face down the way it is printed, then the e-paper module, then the case on top of it, the board, the battery holder, and finally the wall mount, whose plate lifts off at the end to show the four hooks that carry the sign.
These are the features of the actual FreeCAD file, shown one at a time, not an illustration of them. Firmware, PCB and 3D-printable case are open source.