Development of mechanical sets for creativity

Children's toys (sets for children's creativity) Mechanical machines, floating boats, flying gliders, etc.
It is necessary to develop a prefabricated model from idea to implementation. We have an understanding of what needs to be done. From you, the ready-made diagram of the model assembly with instructions. Describe what is included in the model. The model is small. Each developed type = 5000 rubles.
A series of models is needed.