Some photos of microcars:

BMW Isetta
To the left a 4-wheeler Standard and to the right a 3-wheeler Export.

Heinkel
The most sold microcar in Sweden

Messerschmitt KR200 Cabrio
This one has a rare option; headlights from Messerschmitt TG500 (Tiger)

Fuldamobil N2
Body of the same kind of aluminium plate as caravans

From left:
Fram-King-Fulda -57
Amica 250cc -93. Licensed as a motorcycle
Scootacar Mk1 -58

This is what you get if you make a mix of Messerschmitt and Goggomobil.

The conversion was made in the 60:s in Finland and the car has been restored many years later.

Same car seen from the backside