The critical factor in the milky way photo atlas will be getting the best possible focus out of the camera. At F5.6 the ground glass is not that bright, but 0th magnitude stars can be seen with help from the loupe. The nice thing is a star forms a clean point at proper focus. So assuming that the film plane and the ground glass really are at the same place (Something to check) it should be possible to establish a clean photo.
Film buckling may be a problem, so a vacuum back film holder will be useful. (see link). At least 3 film holders would be a good number to be able to work in the field. Even that will require a changing bag. Quickloads might be better.
http://www.deadbread.com/crumbs/vac.html
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