Inspired by a page in Being and Time (which I'm still re-reading) I sat down and put down about 800 words just now. This is going somewhere between very smoothly and feverishly, a good sign that I'm ready to be writing it. There are now as many lines of argument going as there are sections in the book (nine including the introduction). If I only write 5000 words on each one, I will have 45 000 word template towards a first draft.
I'm pretty sure now that I'll be able to get to roughly 40 000 words without breaking open my notes or my previous texts on hyperobjects. Once I get there, I imagine I will break out the notes but not the written stuff, at least not yet. I may use that only at the end (70 000) when I look through to see if there's anything I missed.