I did exactly this two nights ago. I had a dead non-fiction book in a bunch of .md files, which would never be opened again. The allure of the large context window leads me to test it with a book and Claude in the role of a critic. I almost haven't slept that night. With the help of Bard for some up-to-date references, I have managed to double the word count to 40k and restructure it while vastly improving it.