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I wonder if you start to design a F1 racing car, which one is the first, second, and the third to design (such as an order)? engine, aerodynamics, or chassis?
You have to do all the big components (engine, gearbox, fueltank etc.) first. After that you make the body (aerodynamics as you call it) around those big components you made first, that way you are sure that they fit. After that you make the monocoque. That is how I would do it anyway