2. "Rabbi Meiselman posits that no Rishon ever understood the details of the Creation given in the Torah to be anything but literal."
Then Rabbi Meiselman is wrong. Rambam explicitly writes that:
The account of creation given in Scripture is not, as is generally believed, intended to be literal in all its parts. (Guide For The Perplexed, 2:29)
Furthermore, according to the explanation of Shem Tov, Akeidas Yitzchak, and Abarbanel, Rambam was of the view that the "Six Days" are not time periods at all.