This is the K-form (Kamm/Koenig-Fachsenfeld) of the 1930s FKFS research,done next door to Daimler-Benz.
In side elevation,the car is an airfoil shape of particular fineness ratio.Any length of the body is a 'K-form',including the full tail.
Hucho recommends elongating the body along similar profiles,while pinching the width of the body in plan-view.
Your ultimate drag is a function of the length of the body.
As low as Cd 0.12 as shown in full length with all the other tricks (as a simple model).