I can't really tell. As long as anything transmitting actual current rather than just signal lines has a decent trace width, it should be fine. For big currents I try to use those trace width calculators. I don't know what current those LED's take, but I'm assuming something reasonable like 16 to 24mil is adequate. I've done LED brake lights before, but those were just point to point wiring on perfboard.
It would be pretty sweet if you could tap into a tach signal to make the pattern RPM dependent. So faster flashes for faster engine. I don't know if you did that or not, but I couldn't see that on your video.