Originally Posted by AkamaruChewtoy

Hmmm... getting closer. New problem - your right lung. Might need to sacrifice some of it to make room. Could leave you a little slow of breath. Unless you are already huge, then it might not be a problem. And you'd still probably need full body irradiation and immune retraining.

Tell you what, I think a good starting point would be trying to insert a rat heart into a mouse and seeing how that goes (especially since most of what I've been talking about has only ever been worked out in rodents). Going to need to find some SCID mice to make this happen and may have to clear with the animal control board, but we'll get there.