As i remember this isnt "real", but big woop he wasnt all metal anyways, if you had a full metal body then you would be a chunk of metal with a head, that was not what happened to vader he had a suit that allowed him to live.
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Actually he was something like what you mention. In episode 3 we will see anakin's and vader's true inner power(being burnt). And sidious showing what true sith means
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lol well im lookin forward to that movie, i could imagine vader trying to fight an army of jedi with a hunk of metal for a body!