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I assume you mean to have buttresses with Lexan panels?
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Those are examples of external ducts. Here's an external duct that is not a flying buttress on a Ferrari.
They can be effective, the Ford GT reduces the effective cross section of the body toward the rear.
The GTI W-650 has an effective wing and a top speed of 300mph. It is essentially a bubble-top coupe with a buttressed wing that doesn't exceed the stock Golf envelope.
I think aerohead's example had sail panels instead of flying buttressses, pending his confirmation. Sail panels are like a shorty Kamm-back.