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NO design that relies on nonexistent materials is anywhere near "realistic" - simple as that. This is about aerospace engineering, not theoretical physics. TRL = 0. Following your logic, the sphere form Wells' "First Men in the Moon" is a realistic design, since all it needs is for Cavorite to be invented! And I don't watch movies with apparently mind numbing plots just to see gravity defying CGI scenery with overgrown Smurfs float by.
