Hear is a bit of history for you. The Ice House concept is an old one. It came from SDC's first design guru, indeed the man responsable for the entire look of SDC , the flooded mine, Grandfathers, the tree house, float trip, and long forgoten buildings like the silver palace theater off of main street, and the patent office which is now the funnel cake shop by the blacksmiths. I'm speaking of the late Andy Miller of whome the parks internal Andy award is named.
Back in the early 70's he was hard at work on a design consept for an attraction called Superstition Walk. Late in its development plans changed for a bigger budget attraction, and he came up with the Ice house coaster. The drawing you have is his and hung in his office for years. It to was scrapped in favor of Rube Dugans.
In the Mid 80's I barrowed the concept and turned it into a suspended coaster with ice block cars slung from big tongs to sit on the back side of lake silver. This along with a dozon or more concepts (including another big coaster which I'll talk about another time) were taken to a school in St. Louis where we asked the kids and there mothers which concepts the liked. Where as coasters were the kid faves, they were at the bottem for moms. The compromise ride voated on was the lost river. And it was so. Another incarnation? I'd love to see it.
Hope this sheds some light
more later......