I would have you consider the 1993 Team New England TNE-II design.It would have won the North American Solar Challenge had it not been for cloudy weather.It was faster than the 'winner' by far.Cd 0.10 and low projected frontal area,plus very stable in cornering.
https://en.wikipedia.org/wiki/Team_New_England
Also,the 2013 Cambridge University CUER solar racer,Cd 0.10,and even lower projected frontal area and surface area.
Laminar boundary layer shapes are going to look great in the wind tunnel and CFD,depending upon Reynolds number,but in a real race environment,it will be impossible to attain a laminar boundary layer flow due to Earth's turbulent boundary in which you'll be racing.