Quick update... I was off work today and so working on TMGS. I can report that I have just completed my first playthrough from start to finish of Act II. I had played parts before, but never the whole thing through. I found a couple show-stoppers, but slogged through by using the console. I made 166 notes of things to fix and tweak, and that will consume the next few days. There's still a lot of polishing, but it was a major milestone.
More to come.