No, the strings wouldn't be set near that far apart within a course, but if
you have .035" thickness strings with an additional .050"-.060" spacing
within a course, that would add about 3/16" to the total width. In practice
most designs with paired courses however do not try to keep the full
between course spacing the same as single course instruments. It would
often end up in a neck that would simply feel to wide, and awkward with
the exaggerated center to center distances between courses.
I've never bothered to measure or calculate the differences between
paired and single course spacings, but it should end up as a compromise
between the two. Perhaps 1/3 to 1/2 of added course width should be
added to the neck, bridge and spacing? This would add about
1/16"-3/32" to the overall spacing. Of course I'm guessing and pulling
these numbers from a very loose mental image, so don't hold me to it.
I don't have any real measurements, but if you don't have a specific
request or preference for a style I would look for an accepted standard.
Most manufacturers and dealers will have photos posted online that
should be easy enough to at least approximately scale.
_________________ Eschew obfuscation, espouse elucidation.
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