[Christ]

Several of those vehicles' "snow-aero" was influenced by other factors than the straight flow and existing vehicle shape...

While the photos are interesting, they're not scientifically viable at all.

However, wind deposition can show the most aerodynamic shape for a dense object over time. A long time, usually.

Also, without knowing the approximate wind speed when those shapes were produced, it's impossible to know whether or not the shapes would be ideal for a specific speed over another. Average wind speed creates differing deposition shapes, and is still affected by other factors, such as sheer direction and variable speed, as well as the presence of objects which might create resonance at a given speed, or compress flow between the object of resonance and the object of deposition, which would change the flow profile, and thus, the shape of the deposit.