I've been reading through some of the reviews; fantastic job, guys (including the wacky humour) !
If you'll allow me just one small suggestion:
While I understand the benefits of reducing the filesize, I do believe that at a whopping 60 pages (or 30 double pages) filled with colourful imagery, you could afford a bit higher quality/resolution in the published PDF. I'm sure that 40-50MB instead of the current 17MB wouldn't break anyone's storage in current systems, and there might be a significant improvement in visual quality, especially in larger screens.
Ta! (<-- yes, I actually just wrote that!)