I do something similar with 4x5. The plastic dark slide is easy enough to cut. I simply measured it out and drew lines with a pencil where I wanted to cut. Then I took a pair of household scissors to make my cuts. (Note that it is best to dedicate a spare darkslide for this
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Below is an example of the two images on a single sheet of film. Once I am set up it is possible to make the second exposure by rotating my back 180 degrees. This way it is possible to bracket, or make another exposure when the light changes without going to a lot of trouble to recompose the image.
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