> The only reason why cars are the size and shape they are is because ICE engines couldn't be made smaller. Electric engines on the other hand are small enough that I can have the chassis of a fully functioning car be light enough to lift by one man.

You have seen a motorbikes/mopeds, scooters and micro-cars surely?

An electric bike is essentially a moped which have existed for like 70-80 years now? A small cars have been around since the 1950s.

Cars are the shape they are because normally you want the option of carrying 1-5 people. 5 people is 2 adults and 3 children. BTW cars in the past were much smaller. Compare the size of any car from the 1930-40s in the UK to a modern European car and you will notice it is much smaller they are.