Those things were inventive if a bit trippy.My dad had an Isetta 300 in the 60's in red like this one in the Science Museum in London. They were less than 90 inches long and had a fascinating entry & exit system through the front!
View attachment 105658P1000997.jpg by nearlycossack, on Flickr
P1000999.jpg by nearlycossack, on Flickr
And talking of Minis, there's also an interesting cutaway in the museum showing just how clever it was to package 4 adults into a vehicle 120.25 inches long. The more recent Mini is about 2 feet longer.
View attachment 105660P1000996.jpg by nearlycossack, on Flickr