Interesting! I had at one point debated creating an internal organ set to sit within Poser figures_ (I'm a medic and had thought it would be incredibly useful for medical illustrators and perhaps visualisations for patient education/ biology texts etc) I don't think accurate high detail anatomical models would be that easy unless one used something like the A.D.A.M CTscaned model as a basis for modelling. I'm not sure the market would be large enough to make this a 'cheap' project! I agree that Rhino wopuld be a good place to start!