Good input guys, I had not thought of the noise aspect. A windy day sure makes that front door screen on my house sing like the devil. Have to wonder if the noise would be any more or any less than tire noise we have grown accustomed to on the highway.
Perforated aluminum would be an interesting choice. I once built a work station booth-like enclosure upon which I could hang my drawings while working on my drafting board. Three feet away you could not see much though the panel (perforated steel), but at six feet, 20 feet........ the more the distance, the more transparent it became.
The links Freebeard provided mentioned a possible additional benefit I was unaware of.
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The device minimizes the strength of the separation in the base and wake regions of the ground vehicle, thus reducing drag.
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It's sunny here, gotta get out and enjoy it. Will return to this thread soon.