Wielding the notorious Template, this is what most people would give you. Match the ground plane and peak of the roofline.
I would listen closely to what Sven7 has to say. The roofline probably has good attached flow. But the lower body has the air moving differently. Notice the overall length doesn't change much.
My understanding of The Template is that you treat the underbody separately. So here it is matched to the wheelbase.
Then I take those two results and combine them.
At this point It's down to picking a truncation. Again I would listen to Sven7 on how big a bustle you might care to drag around.