An aluminum splitter at the bottom will help the aero and add the strength you fear you may be missing. I don't think standard metal drip edge will be up to the task, you may have to fabricate something from scratch.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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