The 'contour' dates to 1790, and Sir George Cayleys 'cods' head / 'mackerel tail', embraced by naval architects.
It has the 'head' 'shoulder', and 'buttock' of Frederick Lanchester's streamline body of 1907, but lacking the 'tail'.
The 'tail' would be addressed by Koenig-Fachsenfeld in 1935, with his extensible tailed 'Kamm' Saloon.
Rendering a modern take on a 'Kammback'.
The 'slow' roofline will provide rear headroom and interior cargo volume.