I know it might be heresy here, but, calibre is not the be-all and end-all for PDF conversions.
As an experiment I located a copy of the book on the web (all 772 pages of it in a PDF) and tried a conversion in Nitro PDF Professional 6.2.044 (an older version). In less than 4 minutes it had done a conversion to a Word DOC file; and from looking at it, a pretty good conversion.
It might well be worth while to find a PDF editor you are happy with (many of them have trial versions) and use that to do a conversion to a Word document.
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