The main model of the SLS AMG came from an old work - a high quality poly model - that I made to complete my graduation design. There are already too many tutorials that cover creating a car, so I'm just going to talk about some skills, to reserve space for more important subjects like lighting and rendering.
To start, I used a real-world size to model. This is very important for physically corrected rendering. In addition, it helps to enhance your model management. For vehicle modeling, I always use the CM-CM unit (Fig.03).
I set the wireframes according to the object's structure. Poly wireframes will be arranged in accordance with the shape and structure of the target object. First, you should build the construction lines, then build the other lines. The red lines in Fig.04 are construction lines. They decide the object's structure and surface, so I made sure they were right first. After determining the structure line, I arranged the other lines (shown in blue) according to the direction or the surface (Fig.05).
Sometimes you can't make detail in normal ways, so you should find an easier way: collapse it (making sure you reserve a copy before the collapse). For example, modeling the radars would have been hard using normal methods (Fig.06).
When I had made sure the main surface was nice and clear, I collapsed it. This gave me a subdivided mesh (Fig.07 - 08).