Not the sort of thing a sane person ought to attempt solo.
So I don't really know if I can pull this off... but here are some early concept sketches.
The ferry... with only one sample passenger so far...

The ferry terminal...

The elevated train...

The hero...

When I review these pictures, I am aware of some style differences. The train shot is a little like the Golden Age toons from Warner Brothers or Disney. The ferry and the terminal are more like "Yellow Submarine."
Is that too much a continuity problem?
In case you're wondering, I'm not currently planning on importing the backgrounds as vectors into AS... I would expect I'll try to do the backgrounds as bitmaps...