Think PMDG is simulating this in the NGX? LOL, just kidding. Luckily, however, the worst injury was a broken leg!!! http://www.theaustralian.com.au/news/world/caribbean-airlines-jet-breaks-in-half-in-guyana-crash-landing/story-e6frg6so-1226105391798

how on earth did they do it and how is it staying up?

Simple physics - cut the front end off and the back end will fall backwards around the landing gear which is acting as a pivot point. As for how they did it - they ran off the end of the runway. Best regards,Robin.