I think not. It is not possible at all. One part can be replaced but other cannot be done. Practically organ can be transplanted but body cannot be rebuilding fully. Due to complexity of our body, cells do not allow changing them fully. One replaced another might have problem in rebuilding.
The our body is just like a remarkable biological machine that is always supported and maintained by well-structured body systems and their unique organs, all contributing in different ways to the biological, physical, mental, and emotional health of a human being. In our body, a hundred trillion cells, 60 miles of blood vessels, a 3-pound brain with 50 to 100 billion nerve cells and amazing thinking capacity, and 2.5 billion heart beats in a life time of 75 years, to name a few of its unique characteristics.
One of scientists have shared one idea and this is “Couldn’t the brain be situated in the chest cavity, near the heart instead in the head? There is another factor—if the brain was in the chest, it would be far less vulnerable to injury”. Our human bodies evolved in a very different era, under different environmental conditions.
Certain organs to be useless, it is important to note that “useless” does not necessarily mean the same thing as a vestige of evolution. A vestige is a trace of something that existed generations ago. Something can be of use and still a vestige, as long as the use is greatly diminished. For example, nipples on males are not a vestige since they did not appear on ancestors which had functional male nipples. On the other hand, human body hair, which is a vestige, is not useless because it is known to aid in the detection of ectoparasites.
Most important is that, which organ (or organs) in an adult human body is able to regenerate naturally, to the extent that a living person can donate part of this organ to someone else, and within several weeks the two parts of this organ will regenerate into functioning, near-normal-sized organs?
But one possibility is there in humans with non-injured tissues, the tissue is naturally regenerated over time; by default these tissues have new cells available to replace expended cells. For example, the body regenerates a full bone within 10 years, while non-injured skin tissue is regenerated within two weeks. Every seven years (or 10, depending on which story you hear) we become essentially new people, because in that time, every cell in your body has been replaced by a new cell. In humans with non-injured tissues, the tissue is naturally regenerated over time; by default these tissues have new cells available to replace expended cells. Some patients who have a diseased portion of their liver removed are unable to regrow the tissue and end up needing a transplant.
Why would you like to rebuild the human body? It's true that we are not perfect but I think it's better that evolution will make the rest. It's true that there is the technological progress but now we understand a little bit of our mechanisme, we know and we understand just a little. We need a lot of studies for all knowledgement. Do you rebuild only our brain? What we know about it?
Compared to various living organisms characterized by a much lower level of organization and body structure, the human body has limited regenerative abilities. However, along with technological advances, in medicine, genetics, microbiological tests, etc., the possibilities of transplanting various organs, limbs, growing specific types of tissues and rebuilding certain parts of the human body are gradually increasing. One of the most difficult and perhaps impossible to implement in the future is the rebuilding of the central nervous system, including the human brain. Similarly, it will be extremely difficult in the future to build artificial awareness in artificial neural network systems as a continuation of the progress made in the development of artificial intelligence.