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Looking at the pics, especially the interiors...
About twenty years back, the Industrial Design Centre (IDC) at IIT Bombay had designed a beautiful autorickshaw, given their ubiquitous presence on the Indian scene. This design has striking similarities. I'm almost sure that somebody from IIT Bombay (or even an alumnus of IDC) has a hand in it. Probably the student who designed then is the cheif design engineer now at Tata Motors. In which case, a large part of kudos should also go to IDC at IITB. (Will some alumnus of IDC please confirm this suspected connection?)
Nano is a beautiful piece of design and will become an international case study. The problem lies with defining this as a car. If described as a market-appropriate personal transportation vehicle (even autorickshaw was one), this is an awesome piece of engineering!
Without meaning to hurt any sentiments, I assert that this is the world's most luxurious autorickshaw!
Muttom