Some more parts arrived, so time to have a little fun installing!
I needed some hose to connect the aux heat fan to the top of the "J" tubes, so I ordered 8 feet of 2 1/4" neoprene ducting hose from Aircraft Spruce, since that was the only place I could find this size that could deliver this year. Turns out I could have gotten away with only 5 feet, since I have 3 feet left over.

Technically, the fan outlets and the "J" tubes are 55mm, and 2 1/4" is 57.2mm, but it fit just fine. There are sellers on ebay selling 55mm hose, but they are in China and who knows when it would arrive. I also found 2 sellers from the UK, but they were
really proud of their stuff, and it still wouldn't arrive any time soon.
BTW, at this time, the heater hose being sold by 914Rubber is the wrong size -- it is 2.5", which is just too big to fit or clamp down properly. However, when I called them and explained the problem, they immediately offered to send me a shipping label to return the hose and promised to get the size fixed.
I also received my order from SuperBrightLeds, and now I have a functional back pad light. I got the 42mm bulb in "warm white", and it fit perfectly into the light fixture I got from 914Rubber.