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testing
If it's at all possible,I would encourage you to tuft-test the tail before you commit to the design.
Anything above 20-mph ( on a dead calm day ) will tell you what you need.
It's hard to tell from your photos,but it looks like there is a sudden,angular transition at the roof,and reflex at the sides especially below the beltline.
If so,you'll have immediate separated flow ( exactly what you're not looking for ).The flow will reattach on top with some efficiency loss.I'd be suspect to the sides,as there is not as much energy available to sustain flow.
What you've mocked-up holds much promise,and a quick test would soon tell you whether or not to cement your design.
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