Bosch FSN RA32

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Other woodworking
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I am looking at getting an RA32 1600 guide rail, to use with my OFA router sled.
I can see how the first hole is positioned in respect to the cabinet / panel bottom but I cannot see anywhere how the distance from the panel edge is set to 37mm so that I can build cabinets in line with the System32 priciples and use specific Sys32 hardware.
Also, while making a tall cabinet, how can one extend the line of holes beyond the 1600mm of the rail and maintain the indexing spot on.
Thanks for any help and advice.