Walt
Not sure what has gone wrong with the page, drawings are right size but page is huge
took me ages to find the post comment thing.
The idea is sound but I am not sure that a disc rotating like that will work for long without rusting up(at least in this country). I think you can simplify it to a single pivot.
The big snag is that you have a control rope where it is best to put the cable.
I have done things like this in the past with good results but it used a simple equivalent of slip rings for the power. The site was so bad and the wind so twisty that a direct cable connection may not have been practical in this case.
I normally prefer to use a sleeve sliding on the outside for the tail control and keep the wires down the middle. Some have suggested using the cable as a control rope but the force is more than I would want the cables to take and you would have to offset the cable weight with long cables.
Good basic idea, I am sure you can make it work.
Flux