Wow, thanks for the photos everyone!
I do believe they stated it would use a wooden frame in one of the interviews, but I'll have to look again when I have time. It wouldn't make sense for them to use a steel support structure here I would think, not only due to aesthetics but also cost and purpose. It's already a hybrid wood/steel coaster, if they used steel supports why bother using this kind of a deign at all?
This is the first I've heard of pre-cast footers as well. Seems like a very strange process to me, but maybe I'll understand more when I actually start taking soil foundations classes next fall.