Jeph York has this to say on the MMW boards:
"For those curious about the layout, each Classic X-Men issue is presented like this:
On facing pages: the cover of the original Uncanny X-Men issue being reprinted/updated, and the cover of the corresponding Classic X-Men issue. (Example: X-Men #94 on the left, Classic X-Men #2 on the right.)
Under the UXM cover is a paragraph summarizing the issue's story, to give context to the new CX story pages that were inserted into it. Then a shorter paragraph talking about the added pages -- where they fit, why they were inserted, what they alter/update, etc. Then a quick description of the CX issue's backup story, and where it fits into UXM continuity.
Turn the page, and you get the CX issue's inside-cover frontispiece. That's followed by the new story pages that were inserted into the UXM issue.
Right after the new story pages, are excerpted **panels** from the CX issue -- any panels that contained a major change to art or dialogue. Those single panels are presented next to the original UXM panels, to better illustrate the change. There are occasional notes explaining why a change was made, but for the most part it's just obvious dialogue tweaks or mistake fixes.
After that comes the CX issue's back-cover pinup, which here serves as a "cover" for the issue's backup story. The backup story follows the pinup -- and that's it! (If the issue contained any other pinups or extras, I ran those after the backup story, but those were rare.)
Wash, rinse and repeat for all of issues #1-44 -- after that, the backups ceased. But wait, there's more! Extras include:
Full-size cover gallery for Classic X-Men #45-110, plus any new pinups that were in the issues.
Full-size cover gallery for other notable X-Men reprint series, like X-Men: The Early Years.
Full-size cover/pinup gallery for books that reprinted CX backup stories, like X-Men Rarities, X-Men: Lost Tales, Sabretooth Classic, etc.
Any and all other X-Men reprint books that added new story pages to an original issue are included as well, with the covers and new pages laid out in the same fashion as the CX issues. Those include:
Amazing Adventures #1-14
Marvel Triple Action #45
X-Men Classics #1-3
There's also a passel of original art donated by Arthur Adams (a lot of it is tucked between issues as we were running short on space), including pencils for an unused cover to CX #1. And then there's the usual extras - recolored TPB covers, house ad, Claremont's intro from the old Vignettes TPB, etc etc. It's a hell of a package!
(Oh, and speaking of the Vignettes v1 TPB -- we junked the files and re-did the restoration for all those stories. They look a LOT better.)
This book was a massive, massive pain to put together, but I think it came out well -- and I hope you all enjoy it!"