Thanks to a friend with a Prusa, I now have a case!

...with internals glued/sealed in with silicone to make it air-tight, including round the power switch and USB socket.

Before I completely seal the two halves, I want to:

- try it out for a few weeks to see how often it gets used and how

- sort out the battery charging - which is clearly non-existent and borderline dangerous

- add a bass-boost filter to the inputs to the amplifiers to compensate a little for the lack of box volume and driver efficiency

- maybe even swap out the board for another that doesn't have awful (and loud!) Chinglish voice announcements, in favour of a nice 'bing-bong' or something.