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What about leaving the bottom as it is and just add an air dam and maybe side skirts?
Instead of making the air flow smoothly under the car, you'd make it move smoothly with the car. You would not enclose it completely so all the heat can still get away.
The front of the Dart is basically a big rectangle and will push a sizeable bubble of air ahead. An air dam would work well with that (in my very humble opinion, posting just after THE expert on these matters).
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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