Thanks guys!
UltArc, I remember you purchasing a bike rack, but it seemed like you focused on other projects instead. Part of the reason that I wanted to try this was because members had discussed it, but I had not seen anyone actually do it.
Why did you use a wooden frame instead of PVC? I can try to make a full boat-tail, it just seems like the best way to keep the front end attached is to make a Kamm-back and then a separate boat tail. However, I could always use rare earth magnets like Christofoo.
I can use Gorilla tape instead of automotive double-sided tape? I do not know where I bought the duct tape that I was using to keep my materials attached to the car, but I doubt that it was the dollar store, and it did not inspire confidence. I thought that something like duct tape would help to smooth the transition, but at least on the top and sides, the Kamm back will be more like a tangent and a circle than a ninety-degree angle, so I will probably either Gorilla-tape the edges or use double-sided tape where the two surfaces meet.
My materials seem sufficient for the Kamm-back, at least a prototype, I just wonder if I should put in a frame to give it more of a curve, it is kind of flat.
Thanks for your input!