How big would a human have to be to have a full set of redundant organs?

I'm trying to design a realistic genetically engineered nanotech super-soldier with a full set of redundant organs. How much more interior volume and thus height/weight/muscle mass would a human body need to support 2 hearts, 3 lungs, 2 stomachs, 3 kidneys, 2 livers, 2 sets of large and small intestines, 2 esophagi/trachea, and 2 sets of certain major bones (femur, spine, humerus etc.)? Additionally, could a human brain be "taken apart" and redistributed throughout the body while still functioning? This super soldier should be designed with as many safeguards and redundancies as possible.

Also, this bio-engineered human needs to still look... human. Is it possible to accommodate for all these changes with only an increase in height and muscle mass, or is it inevitable that anyone with this much modification will start to look like a walking tank made of meat?

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How big would a human have to be to have a full set of redundant organs?

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