After a little tinkering I've further simplified the workflow required to implement this layout
The impositionis are the same. However, instead of having two imposition templates with a rotation in between, the workflow contains a single imposition template with two stages. The settings for each of the stages are the same as the settings in the separate imposition stages above with one exception. The top page cell in the second stage is rotated 180 using the Cell Transformation Mode
One other thing to understand: Job Group imposition is always performed on the last imposition stage. When that Page Order is selected, the option to add more imposition stages is disabled
This workflow can be implemented usingthe following workflow
The key to enabling this worklfow is ensuring that the input file is a PDF/vt file.
Rotate will rotate all pages 180. This is done as preparation for imposition. By rotating 180 before and after imposition the workflow will effectively fill pages from the right to the left per requirements.
Split is configured to Split By variable data records. This will divide a PDF/vt file into multiple files using the defined PDF/vt record numbers.
The Divide Records by Number of Rules option divides records so that the number of records in the resultant PDF/vt files are as even as possible.
After the files are split, each PDF/vt is imposed as a single row.
The imposition is done using the following settings with a .5" margin all around.
The result will be a single row in which PDF pages flow across the sheets. Record pages may span multiple sheets but they will remain as part of this single row.
After this imposition the PDF/vt are rotated back 180.
The result is a 1 x N layout in which PDF pages flow across multiple sheets in a single row
In the final step, the workflow uses the Job Group imposition in FFCore to impose both PDF/vt files into a single layout.
Each PDF/vt will be placed in a separate row in the layout. This will ensure that all records for each PDF/vt are imposed in the same place across all imposed press sheets.
Lastly, this also requires that the Page Order option to Apply to Each Variable Data Record be disabled.
The imposition uses the PDF trimbox so the margin added in the first imposition does not affect the layout in the second imposition.
Job Group imposition required that the Collect Job Documents options be enabled in the workflow