The Film record will use the proposed contribution of a Work authority from MMI
Unmodified contribution
Mockup
I think display name needs to be derived from other fields (as with person and org). Check to confirm.
Connection between Films and Documents would be reversed from XDB/CineFiles. Instead of entering Document (Cataloging) relationships on this screen, there would be a field on Cataloging for "Related Films". On the Work screen, the related Documents would show up in the right side panel under "Used By"