Nice puzzle - it must be one of the oldest I've done. I finally got it solved last night but it had taken me ages to work out. So I thought I'd show it to my son The Bobcat as a bit of homework in the summer holidays. Embarrassingly he had it all worked it out in about a minute.
We went to pick it up tonight and started the wrong side (and reading the other logs we seem to be following a long tradition). It was an easy find once we had crossed over.