So I finished designing the new casing. I was smart, and made it so the button pod was reusable. I did have to tweak the height on that just a bit - the top cover wouldn't fit.

The base, which has the arm mounts, is snap-fit onto the bottom.

Next up is going to be integrating the tiny OLED screen. I figure I'll run animations on the LED matrix, as it's a bit clunky for any real information. The OLED is a simple i2c device, and can share pins with the HT16K33. I'll just make a mount for it on the top side of the main case.