It actually has been worked out. If i recall from my survey course in Nebraska, the base unit is 36 sections (6 miles x 6 mile). One of the section (lower right maybe?) is actually not square and not a full 640 acres. This is where the error in the curvature of the earth has been accounted. If you find the USGS survey maps of the US (probably in a depository library) then you can find the main parallels and see the one section in every 6x6 section square is somewhat trapezoidal spaced.
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