Yes on the heavy part, but you need some weight lifting anyway! 
I would go with the MDF (the kind that has a vinyl on one side is better) and keep it stored on edge when not in use. Still would use the granite for building surface. MDF will last some time if it is kept dry.

I would go with the MDF (the kind that has a vinyl on one side is better) and keep it stored on edge when not in use. Still would use the granite for building surface. MDF will last some time if it is kept dry.
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