I like what you're planning to do, Jabb
Will the rear of your boattail be open or closed? I believe that someone here tested the latter to be more effective.
I wonder if the lights you plan to put on the extension must be from your model, or if any kind of light fixture (as long as it is certified) will do. This would make it easier to install. And don't forget about the license plate.
I can't remember if I've linked this before:
Kammbacks & tail aero info
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread