[MetroMPG]

I think your "multi-boat-tailed" illustration -- where you fair in the rear fenders & main greenhouse separately -- would look eye-poppingly fantastic in real life.

But for best aero, you'd need to blend the fender tails into the greenhouse tail for best effect - there's going to be messy air in the gaps in between them.

Which way are you leaning? Do you have fabrication experience to tackle this kind of thing?