I (hopefully) fixed the cover issues, and I have submitted the whole, improved shebang to Create Space--I should be able to order a second proof tomorrow if all goes well. I turned the first proof over to my crack team of illustrators, who were both delighted and chagrined to see their artwork in an actual book.
The e-book stuff is still fairly aggravating--I'm having to slog away editing HTML, and honestly it feels like Amazon has really made zero progress when it comes to books with art. I think I can make this work, and of course it still takes less time than a paper layout, but I also think it's been six years, and maybe they could have made this process a little easier in the meantime? Maybe?