I'll volunteer since I've already done what you are talking about ( somewhat )
My idea ( ahem ) THE idea would be to pop out the back glass on the coupe and raise it up a few degrees. Fill in the gaps and extend outward and there you have it ... a coupe with a boat-tail.
What makes modding a coupe so sensible is that you don't have to fabricate any special back windshield. Also, since the roof starts its curve rather early, you dont have to extend out so far with the tail.
I'll post when I find the image.
It's just something I threw together, so no fancy artwork ( But it just might get your brain juices flowing .)
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