The body's organs are more complex than any factory. Attempts to mirror their physiology in the laboratory are now getting closer to capturing their individual intricacies.
This well written article outlines the gains that have been made with organ and tissue engineering, particularly the "organ on a chip" technology which is now increasingly being used for research and testing purposes.
However due to the inherent complexities in all of the human organs there is still a lot more in the way of research which needs to be undertaken. This is in order to allow step wise progress in the bioengineering of organs to be made.