You really did a very fine job with this. I wish I had access to Altium back when I built something remarkably similar to this a couple years back. The LED dot matrix that I created had to rely on a bunch of prefabbed PCBs that I strung together because I just didn't have the software or skills to make them myself. Turned out okay. Your project shows how much better (and more compact) the electrical and mechanical design can be with a proper integrated design suite.
Super cool video! In Fusion360 you seem to be rotating the model independent of your cursor. It looks very smooth and fluid. Are you using a touchscreen or some external peripheral?
