The PEX tubes are all mounted! I still have to install the WS2801 boards with the 6 LEDs, then put on the front acrylic discs. To do this, the hinge screws will need to come out sometime in the future, but right now I really want to see this thing light up. I also sketched a behind the scenes look at how the center discs are supported with sections of 3" cardboard shipping tubes.
I've made seven 4-conductor wires 52" to 60" in length, depending on their position. At one end of these wires is the waterproof connector for attaching to the control box. I've soldered the other end temporarily to 3-LED sections of RGB strips so I can test some code before the main event. Next: attach the ESP8266 in the control box and upload some test code!