I've actually seen a few bicyle sidecars that were built along the lines of a motorcycle sidecar, meaning a narrow place for the passenger low-down.
The one shown is the style of pedicabs used in many places in the world. In some places, they have the tricycle-style with driver in front, in some places, tricycle style with driver in back, and in some places, this kind. Usually, the bikes seen with them are the old-style single-speed Raleigh clones. Try a Youtube search for "pedicab" or "bicycle rickshaw" and you should find some videos of these in use in places where they're common.
"be careful this rando stuff is addictive and dan's the 'pusher'."