Couple of suggestions. I think if you are looking at all at the making of Scottish tradition then you need to look at Hugh Trevor-Roper's work. He has a chapter on the making of highland tradition in "The Invention of Tradition" by Hobsawn and Ranger. He also has a new book by Yale U. Press "The Invention of Scotland" coming out in 2008 (too late for you, I'm afraid). He debunks a lot of myth-making! Hope that helps.