I've just done a bit of a search for you though, none of the usual info sources even suggest it was deleted from the movie (suprisingly in IMDB's cases, where 'truth shouldn't get in the way of a good story'!). I searched for a shooting script, but the closest I found was a draft from 2000. I scanned all the way through that, the story seemed pretty similar to the final film (the big difference was Doc Ock featured extensively), but no mention of any bank robberies, escape helicopters, or catching anything between two towers of any kind. There is a scene where Spidey webs a helicopter, but that was to save himself and MJ from hitting the water below.
Both the teaser and posters were pulled from circulation due to the attack, but it doesn't sound like the incident affected the edit of the film, the Towers still feature in many scenes, many CGI that could have been easily edited to remove them, but the producers decided not to bother.
So there is no need to 're-insert' it, but if you still want to do a fanedit then you could of course add it to the film. By the way, there aren't really any deleted scenes on the DVD, so a fanedit would either just shorten the film or be a combination of the two released movies (or it would be something like 'Batman vs Spider-man'!).