That's really cool. I don't have experience in Sketchup, but do you need to "stitch" the model (make sure there are no holes) before using the 3D program?
The bottom two look very close to what the air "should" be doing. In other words, it follows the aero template. Follow those lines and you will have yourself a (theoretically) perfect boat tail.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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