Keep it simple and effective...

Keep surfacing to a minimum as it is time consuming, it makes downstream tasks more complicated (pre-processing of geometries for simulations, for manufacturing, for assembly). It is more important to have a model that can be maintained and modified quickly:

• Designers need to be able to thicken / shell easily without the need to repair surface quality issues

• 3D printing is growing and so we are using more and more STL files as output

• Traditional manufacturing requires clean geometries to run CAM tools (computed assisted manufacturing) like tool path for CNC machines

Always design solid bodies as 99% of a racing car can be designed using robust mechanical methodology. Only surface external geometries, nothing inside the aerodynamic surfaces of the car needs surfacing. Even for aerodynamic surfaces, most of them can be made from sketches and extrudes. For example, on an LMP1 car only front splitter and canopy are surfaced.