WELCOME! Welcome to the forum!
I would definitely rent or even buy the movie, if you don't already have it, because, not only is it a great movie, with fine performances from William Holden, Sir Alec Guinness and Sessue Hayakawa, but there are enough great shots of the completed bridge, from various distances, to give you some good references for a scratchbuild.
Hope to see some progress pics when you get rolling!
Regards,
Brad