I honestly don't even know what the purpose of the metal plated body unless you don't paint it. Reason I say this is because you still have to sand off parting lines which screws up the metal plating. I asked once if I should buy the metal plated 350 Z or the regular one. Everyone told me if I was going to paint save my money and get the non-plated one. Hopfully this gives you something to use as far as reasoning goes.
Peace
Kevin