Hello Michael;
It took me several attempts but I found the problem and corrected enough to get the document working and editable again.
The 11Mb internal word/document.xml configuration text file was exceedingly hard to work with. Text editors simply do not handle files >10mbs easily.
The problems originated with the images nested with paragraphs within images within paragraphs. FWIW, Publisher would do a much better (and easier) job of image intensive jobs like this. At some point, Word simply forgot where to 'close' the nested content and working out exactly where to close them was the most difficult part.
I've placed the repaired DOCX on my OneDrive for you to reference and download. A thorough review for lost or misplaced content is highly recommended.
