200cc is practical, but the size is not, look at CLEAR, the EU project.
This car is too huge, but requires zero maintenance because of the selection of alternates for different components.
No windows is one reason but the plastic shield windows could be used in conjunction with some junkyard components to have secure parking for long hours (e.g. at night).
But to make it a family car, it has to either adapt to the shape of SMART or CLEAR, 4 seater is not the way to go if the targets are the bike commuters. For a rickshaw this is fine.