I showed my work in post #10
The original file name was 'template MRT1022.jpg'. I find a proportion of 7 to 4 or 1.75. Width at the base of the B-pillar is 56".
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According to Hucho,the vortices induce a downwash which helps maintain attached flow down the centerline over a long path.The vortices begin quite small and grow until they reach the road surface,trailing for hundreds of feet behind the car.The bummer is that you get a high vortex-induced drag which increases the overall drag.
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So if I 'eat' the vortexes at the drip-rail, I could lose attached flow down the back. But if the vortexes impact on the flat top of the boat-tail instead of the road, wouldn't that break them up? Or would the degenerate into new vortexes on the edge of the tail?
The Coanda thing is a little in-joke among myself. You can ignore it. The fenders would probably go to an aero-form, but they would be a lot more work, with the compound curves. I know the bottom half of the boat-tail is compromised.