it does seem as unlikely as the clones that must not be spoken of that a non human body could have a lot of chakra generating from it. Kisame's sword is one exception. I think we can say that it's not likely that his entire body is made of doll parts.

Depending on the different culture, the 'chakras' are traditionally manifested in various parts of the human body (wikipedia's article on this is horrible...) and sometimes generated in several parts of the body. But, almost every time Kishimoto shows one of his explanatory diagrams, it's evident that the most chakra is concentrated in the chest area. I've taken that to mean that all chakra is generated from there.