That made a big impact on me because I'm always intimidated by the act of drawing. I can draw all day long (and even do OK at it), but the moment the drawing becomes "serious" or needs to be on par with some arbitrary skill level I just shut down. So thumb-boards work perfectly for me. I've boarded a number of films and projects the same way over the years. Quick, rough and simple. Like everything else about this project, immediacy, speed and simplicity are the goals.
As you can see, the drawing is utterly lacking professional skill. But they don't need to be fancy or amazing. I'm not out to impress anybody. The drawings just need to be clear.
I've been trying to keep my Twitter account updated with things as I move along.