Here, you can download the original promotional material which was issued in 1979 to the media which contains lots of good information on how the cast became involved in the film through to facts about the filming of the movie. There are several files you can download with the biggest being the press book which you can download below. To view these files, you need a copy of Adobe Reader which can be downloaded for free here.
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Additional Pages
Alongside the pressbook there are a few other files. The first one is an announcement about the film.
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The second one is an interview with Film Bulletin about bringing the film to life.
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Thirdly, there is some information about how the cast stayed fit.
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Lastly, there is some info on how and where they shot the movie.