What puzzles me most is which part of what I have
posted you haven't figured out yet.

(First, for the vast majority of DP books PG does
not have the images and if they did they aren't correlated
to any page numbers that may or may not be in the text, but
that's a detail.)

For many of those early texts, Google, TIA, etc. images are
available and can be used as comparison sources. You
can see that demonstrated at eb.tbicl.org, where most pages
have a page number on the right, which when clicked displays
the TIA image for that page. On the readingroo.ms wordpress
installation I'm currently building the ability to compare the
text of one of those oldies,  http://www.gutenberg.org/ebooks/1013 
using images from here http://www.archive.org/stream/firstmeninmoon00wellgoog#page/n13/mode/1up

You apparently wouldn't find that useful?