The video and results are fascinating. Not stated is that if use use LEDs in a series circuit, both segments should have about the same number of LEDs. A simpler approach would be to wire everything in parallel with a 12 volt supply. You would need to be sure the controller, if you use one, works on 12 volts. As was mentioned, be sure the supply current is above your maximum requirements.
@barnzcharmz mentioned interest in a class. I always encourage folks to teach electronics classes. Hopefully, someone will pick up on this subject. A class, like DMS, would need to touch on a number of disciplines like art, woodworking, CNC, and electronics.
Let’s congratulate @julietag on her upcoming wedding and volunteer to help in our favorite areas of interest. It’s a challenging project. I’ll volunteer to help with electronics - not including soldering. (At 78 years old, soldering is not a fun as it used to be.)