My apologies, I really didn't intend to come across as abrasive. This is just what I do here whenever I want to proof my point or to proof someone else wrong: I sketch down how a thing might look in reality.
And this is the problem I have with your idea: I struggle to imagine how it could be practical and would allow for door-to-door travel times which are remotely competitive with driving. However, I am genuinely curious about what you might come up with, so why don't you give it a "quick and dirty" try? I promise nobody will laugh...