This is a nice effort by Achimspok to reconstruct the last moments of the flight path of UAL175:
http://www.youtube.com/watch?v=-K-WjsHa_2k&list=UU3_8JbpqT1MqihgheIHhRiw&index=15&feature=plpp_video
Please recall the earlier work by Femr on the aircraft impact angle:

The blue plane represents the NIST claim of aircraft impact angle compared to the actual aircraft.
Part 1:
http://femr2.ucoz.com/draft175.htm
Part 2:
http://femr2.ucoz.com/draft175-part2.htm
How do these efforts match up?
