You might find this thread interesting. It describes a flexible way of combining block/outline tiddlers into larger components.
However, I’m still in the early stages of designing an edit UI for the components that uses. It’s not proving particularly easy. The closest analogy would be to Streams, but my use-case is different enough that I can’t use it, nor likely even hack my own choices atop it. I may go back to adding content instead, for a while and mull this over some more; the edit UI is something I don’t really need myself. But eventually this would be taken over by someone with no prior TW experience, and it would have to be simple to use, and fairly self-explanatory. That’s hard work! 
. I know. Too slow to catch a cold.
) I may get to the point where it’s sharable. It’s not that it’s “unfinished” (much like TW, it never will be), it’s just bloated with seemed-like-a-good-idea-at-the-time stuff that really (no, I mean, REALLY) needs to be purged, culled, whatever.
). My suggestion about your page was that if you could lay this out in a tiddler using your usual TW tools and CSS, then this would be easy enough to incorporate into a book.