Wow, nice work. As someone making the same transition for a large Flash app I can attest to how hard this is, especially for accurate font rendering. I've seen a lot of comments on HN along the lines of Flash sucks why don't you use HTML5? As the post points out it's not a trivial switch, canvas is extremely low level compared to Flash's Display List.

edit: HTML5 = abs positioned divs and CSS3 fonts in this case, plus some text rendered as part of background images, still it's really difficult to go from PDF to HTML no matter how you do it :)