I continue to make progress on this big, complicated puzzle and propose an 8 card vertical x 7 card horizontal layout, joined top-to-top at the middle edge, which means 4 rows aligned to each configuration (regular + "upside down").
If this is correct, there will be 28 cards (7 columns x 2 "spines" x 2 sheets) that connect top-to-top. This shows a partial example.
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