I am trying to come up with a wind vane, also, and have been considering the Hebridean kit. Would be interested to know how it has worked out for you. A couple of my concerns were with the course changing setup, and looks like the oar only comes out of the water, but is still sticking out waiting for a hit in harbor. I have done a lot of research on it, and only find Tamie Norie as having problems with his. He may have it sorted out by now.
I am also looking for used vanes for sale. The high cost of new vanes sticks in my craw a bit. So, not sure what I will end up with, yet.