The simplicity of building cars like this might bring the expense down. Remember, every time we build a new model, there have to be all kinds of design changes and templates made, just to see if the prototype of the model is feasible.
This form of manufacture won't need any templates. The designs can be computerized, and the prototypes built as easily as programming a computer. The whole expense and size of making new models comes down once this operation gets all the bugs worked out.