I'm only concentrating on adding words to Nano, at the expense of structure. I may reconsider:
For those of you who are on
track with your word counts, Week Three is when you should start
thinking about how you're going to get a complete arc written in
November. If the end of your book still feels light years away, think
about abbreviating scenes, omitting chapters, and jumping ahead to the
middle-end and end-end of your story. It's much, much easier to go back
in December and flesh out the connecting bits you skipped than it is to
write an entire ending.
It strikes me that it's better to prepare an entire skeleton and give it wordy flesh later. Is there time…?
From Chris Baty's last Nano pep talk