I think Chris has misunderstood that a half frame of 6x9 is 6x4.5, not 3x4.5, the nonimal 6cm is the width of the film and doesn't change regardless of the camera as long as it takes 120 (or 620) so can yield 6x17, 6x14, 6x12, 6x9, 6x8 (Fuji) 6x7. 6x6 and 6x4.5.

Unless of course the Korrelle takes 127 film and not 120.

Ian