So, years after this… (the original post on the LHSWBBT)
It lived in a wooden frame for five years before I got around to 3D printing a proper enclosure. Still working just fine six years later.
There’s no bottom cover. Top is PLA and the bottom edge has a shallow dove-tail I used to snap in a bit of printed TPU trim that makes it non-skid. Cntrl button to the right of the thumb wheel was added after I noticed how often Cntrl-clicks were required.