Well, I did it. The 23rd and final chapter is complete, as of about 3 pm. I fell short of my 40K goal for a first draft. I'll probably fall short of my 80K goal for the final draft. But the story will be what it will be, regardless of how long it is.
I have copious notes on things I want to add, expand, revise. My goal is to have the second draft complete and beta-reader-worthy by Christmas.
Wish me luck.