Great suggestion. And may I add a diary on how buildings collapse. I'm thinking about the "pancake" theory which explains the collapse of the twin towers.
Note: very important for that matter would be to know the actual structure of the centre of those towers (or an estimation of it), and an estimation of the temperature inside after the attack (as a function of time). these "parameters" could be given as an appendix or as a separate thread.

that would be extremely nice. I know nothing about structural mechanics.