i started a project like this once i got a6, but it failed. it was to many objects and if physics objects are in contact to each other their behaviour was very very strange. more than an explosion, but like a slideshow, too. i had an idea about to script it, so that it started braking down from top to botton, but i failed at this one, too. so i gave up that idea. maybe some other person with a better pc (thinking of over 3GHz) and with mor scripting skills can do this...