You can do a search for some of the build threads here for details on building the mods. With my old Neon I used mainly coroplast (corrugated plastic), and when I needed a little more strength I added some 1/8" aluminum bar behind it. I used that for the belly pan, wheel skirts, and kammback. I have a thread for it called 2000 Neon Aero Mods which shows all of mine.
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