Why not look at a torpedo camera back?
 
you have an open area of 2 1/4 by 7 1/4 inches to play with - easy to mask down to 6 x 12 or put your pairs a good distance apart for the longer focal lengths and closer for the 47mm...
 
If you get a back without a window drilled in for viewing the paper back numbers, it's 7 turns for the first exposure, 4 turns for #2,3 & 4.
 
Joe 

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