I'll probably filch your dolly design ... it's better than the one which I had in mind for my Ivory Gull.

We did get quite a bit more proficient at the aerotow. Here's me on the tug and my two pals on the gliders... http://www.youtube.com/watch?v=k74EqrITs6E

But, we found it much easier to simply climb straight ahead. I expect we'll graduate to a more complex pattern next year. The problem is that we are "flying blind", so to speak, because there's no-one round here with any practical experience of this art.