I think there are a couple of key things that would make an enclosed mountain operationally a lot more water going EVERYWHERE. This isn't like Splash Mountain, where inside the mountain water is mostly carefully contained into troughs (lest they damage Audio-Animatronics and the like). Krakatau will have waterfalls and wet people all over the place, which I imagine would escalate the maintenance required in a large enclosed space. Second, there will constantly be people in this thing, as opposed to the Disney mountains where they are mostly just passing through quick in the span of a couple minutes. For Florida, that means you have to have climate control, which again would a