Wow, superb build David! Having been born just after WW2 I was getting into cars about the age of seven and there were a lot of these and Messerschmitt bubble cars in the UK. The way that they were parked facing the pavement helped get out onto the pathway and two, you could get two in an ordinary parking space, as you can now with the Smart car.
The Messerschmitt top was made from the fighter aircraft canopy.
Both the Isetta and messerschmitt were powered by single cylinder two stroke motorcycle engines, noisy and smoky!