I don't think Their rockwork is off but more, not finished, ass scott points out below. Also see below as to what I think is evidence they are not done.
As you will see from the image below I have highlighted four concrete bases which are incredibly large, the same ones that were cast to support the first main steel supports for the volcano. there are more of these on the other side of the volcano opening where the rapids pool enters which are evident in earlier photos that also still don't have anything connected to them. I'm 99% sure these are for the remaining steel structure and rock work that is missing, with today's technology in construction some thing so large as these bases are not mistakenly designed considering every nut and bolt will be meticulously planned.