Why not try using borderless text boxes inserted where the fill-in fields are on the scanned document? That seems like less work than trying to align tab stops, although, if the document is a reusable one perhaps the tab stop idea is still better.
One thing that puzzles me about this article's solution though I don't care to experiment to find out: why put the picture in the Header? Does that prevent it from getting bumped by the text and by being in a header it keeps the scanned image in place?
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