There are two main areas highlighted in the paper concerning car body manufacturing: construction and design work or in other words functionality and aesthetics. The question is to be answered: Which is more important? The solution is untying this quasi contradiction, but it is not an easy task. The ergonomical and aesthetical demands are not unambiguous; they depend also on weather conditions, different anthropometrics, changeable conditions during operation, attitudes, traditions, mentalities, local and actual trends etc. Nowadays the external and internal design does not belong to the main constructor or automotive engineer. The major original equipment manufacturers (OEM) charge special designers to do such work similarly to the separated engine, axles, brake system, electric network design. Nevertheless there are many details that must fit together in the vehicle. As long as the different engineering interests can be harmonized in a rational way, in aesthetical and design questions tastes can be decisive beside rationality. This makes the decisions difficult. The GIST of the cooperation is that future automotive engineers must know the designer's way of thinking at least the main stream in order to consider and make good decisions.