I'm really happy with the response from the editor - she was very happy with the sections on the Vikings and Columbus. I don't feel like quite the imposter I did at the beginning.
Unfortunately, I have to rewrite the entire text of the Paleo-Indians, or rather ancient Americans. We're talking coastal route, rather than land bridge. I've got some great suggestions from our consultant, though, and I think it will be fine in the end.
It's actually due back to the editor on Columbus Day. How ironic. Hmm.
I so hope that there will be other assignments after this - I am having fun!