The little book format works! Implemented conversion from Markdown to the format without styling (i.e. a fixed style is used throughout the document--no changes in text size, weight, etc.). Spacing is slightly off due to a lack of error diffusion in rendering, but that is a solvable problem.
My next step is to write a driver for the eKTF2232 touchscreen controller so that I can get some basic input working. Once that's ready, I'll set the firmware up to allow paging through the book.