As someone who's considering using system dynamics to model musculoskeletal systems, I'd be interested in your experiences. Could you pm me your email?
I work at the cellular/molecular scales in a computational biology program; musculoskeletal stuff can often find a home in bioengineering departments. Not sure how much insight I can offer, but feel free to shoot me an email, my contact info is here: http://www.pitt.edu/~donovanr/