I'm definitely going to build Splash Mountain. It'll be nearly impossible to acquire all of the right parts to build the entire track AND house it in a proportionate mountain. Instead, I think it'll end up being closer to minifig scale.

I'm working on the ride vehicle (in this case, a log) right now. It shouldn't be that hard, I just need to find the right parts to define the look of a Splash Mountain log. I'll likely need to combine Technic and System parts for this to work. I think the most challenging thing will be building the mountain itself. Think, when was the last time you've see a real, complex structure built from Technic and Bionicle pieces? Because of this, I'm scaling it down so there doesn't need to b so much detail. Well...

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EDIT: I take that back. It turns out that its VERY hard to build a Splash Mountain log. The one I'm building now doesn't look so good , but it'll work. It'll work, alright,