I finally managed to organise myself long enough to get Chapter 12 done. This has been posted and should appear on the site in due course.
Please accept this statement with a dose of justified skepticism. Up to this point, my predictions regarding the time required to reach various milestones in the narrative have been wide of the mark. However, I think finishing Book 1 will require only one further chapter.
Ultimately I'm in no position to give an estimate about when this final chapter (of Book 1) will be done. Life is still a bit demanding but at least I've picked up the proverbial pen and paper again.