I finally had some time to sit down and assemble the badge. The accelerometer chips still didn't arrive, but I just desoldered one from some breakout board I found in my drawer. As usual, the QFN matrix controller chip didn't get soldered properly, and I had to desolder the matrices, fix the chip, and re-solder them back. Some traces got pulled in the process, but fortunately for unused pins of the matrices, so it's fine.
Of course my camera can't handle the brightness of the LEDs, so instead of red they appear yellow.