1/2 plate steel bolted up will be beast. Dont forget when you hit an object at 70mph the destructive power is much greater kinda like straw that can stick in the side of a telephone poll during a tornado
Sure, but can you imagine how much weight you would be adding to the car? Plus, you will be that much closer to hitting something on the road. Not worth it in my book. Skidplates are for Jeeps/Offroad. Just an opinion. Unless you are planning a WRC Cruze build.......1/4" plate steel would probably be sufficient for most road hazards.