I've made the files I've created thus far available in .STL format. They're still a work in progress.

I made the main casing 25mm tall instead of 20mm, and now there's room for everything! I also thickened up the thin walls.

As well, I've modelled up the WS2812 8x8 Matrix casing. There's a hole in the back that an Adafruit mic board fits into, as well as room for an MSGEQ07 - Spectrum analyzer time! Also sound-reactive patterns.

I'll upload a diffusion screen pattern later, to be printed in translucent filament.