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An air dam is easier; a belly pan is better. Look at the most efficient vehicles - they go for smooth underbodies.
Someone here used metal screen (like window screen) to create their undertray, then painted it - the paint fills the holes in the screen, making it a smooth "air tight" surface. I thought that was pretty clever.
Someone else here has a Saturn with framing underneath, and the panels were attached to it. Sorry I can't remember which one!
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