I think Toms point about posting the lyrics here was more a way for us to answer the question you posed. Obviously you are quite right to say that the average listener of the song will NOT have access to the lyrics. But then again! You're not asking for their advice/input! I had a listen to the song and, like Tom, I couldn't get a definitive grip on it! But you say this was recorded in one hit? Personaly, I don't think it matters what the structure is! If it's a song that people can relate to, then it's a good song! I have been listening to some songs lately by prog rockers. And frankly! I can't fathom any kind of structure at all! Except the beggining, all the stuff in the middle, and the end!
Interesting subject!