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Anytime you can reduce the airflow through the grille/engine compartment (without engine overheating), it will help. If you can make the bottom part easy to remove, so if it gets too hot in the summer, you can just take it off until next winter, that should be ideal.
I would think coroplast would be enough strength for the parts on the back end. There shouldn't be too much force against it there from driving - not sure about your 90 mph winds!!! If parked in a position where the wind hits it from the rear, there may be a problem if it's not strong enough. Added benefit to the coroplast: keeping the weight down!
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