From his blog, Process Recess:
James Jean “wrote the treatment and story for the film, created finished style frames, designed the characters, and roughed out 75 or so storyboards for which the very talented Jared Purrington helped finish and render in watercolor.
“Below are the style frames and some of the orthographic and production drawings used in the actual film.”
More images on James’ blog, www.processrecess.com.