Hi Henry,
You post has me interested to read this book. I have been studying Ecclesiastes for the past 30 years and thought I had read most everything but this one is new to me.
I would be interested in your ideas on authorship. I am currently writing a noveltary (story based commentary) where the author, Kohelet, is a librarian for the king. (sample chapters at http://www.artofwork.ca) Its been quite enjoyable to write as this past year I completed a decade long project in translating Ecclesiastes, memorized it and now tour it around as a one person show. Its been an amazing journey to say the least.

I look forward to reading more of your thoughts on the book.