If we are ever to dream of a planned capital with skyscrapers, it's evident that Kathmandu will not be able to handle this. Chitwan looks like the best alternative. There was a Japanese guy, who had a naturalized Nepali citizenship and had contested in the elections. I think he was the one to bring up this issue for the first time, and he had a long research to prove his point. He had other plans as well, but I've forgotten most of them. It'd be great if someone here could point out to any source that contains his plans.