I realized that I needed space to have rubber feet (so that the downward firing speaker’s audio isn’t muffled), so I had to redesign the speaker grill to be smaller. I added in some rubber feet once that was done and there was room. In the process, I also decided to use the rubber feet’s screws as a way to screw the display cover and the rest of the enclosure. Finally, I went on Mouser and found a pretty good fitting speaker for the case, and I mounted it inside the cube with some M3 screws and nuts.