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Old mech - Since it looks like the 'cage' of your design will be, ultimately, it's structure, could you save some weight using thin fiber-plastic [FRP] paneling for a body? Or even some non-structural fiberglass...
Might help cut down on road noise if you used PVC panels, since PVC is acoustically inert... and sort of temperature inert as well, which could also save on heating/cooling load.
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