So we can expect threads to give birth to "chapter 2" and so forth from time to time - but of course each chapter might be long enough to have several parts...

I knew it was all going to get complicated. I think the best way is not to try to plan it out in advance, but just to let things work out as and how it happens. And then at some point if need be, to tidy it up according to the rules and customs that have developed, taking account of problems that have cropped up.