It's an awesome idea, and one I would love to see.
But, couple of things to consider: The cost to built the same thing is the states would be 3-4 times higher. Just has to do with where we live and what people charge over here for contract labor. Plus, the cost of land. It would have to be in a populated area, to hope and collect any revenue back. Make kayakers would not pay to use it during the summer months. And, it better be heated if it's open all winter.
I say... Lottery Dollars? Hey it worked for the local skate park. Best in the country. Why not a white water dome park? Do kayakers really need to see the sun to kayak? Indoor comps year round. Kids classes in the lower eddy....
I love to dance, but who needs the music- It throws me off.