Computer Attack Modeling?

I am wondering why there haven't been (at least to my knowledge) rigorous computer simulations of the effects fully fueled 767's would have when crashing into the twin towers at the same angles and velocities as they did on 911. Such a study should be able to predict (based on the original tower blueprints and load bearing abilities of the steel) with mathemetical rigor the results such an attack would likely have on the building's structure (i.e. localized damage vs. total collapse). Isn't this well within the reach of present day computer modeling? I am aware of Prof. Jones study, but am hoping for a visual presentation that would have greater reach with the general public. Any Physics majors out there willing to give it a shot?

study should be able to

study should be able to predict (based on the original tower blueprints and load bearing abilities of the steel) with mathemetical rigor the results such an attack would likely have on the building's structure

since what we were presented with by the govt/media showing alleged ua175, many of approaching wtc2 and several of actually entering it seem to be nothing more than strange images behaving in a most un-plane-like manner and some with even conflicting flight-paths on the approach, (click my name to see a rather involved analyses of these images), i myself would be very happy to see what results a model of such an attack would likely have on the 767.