I could see the Game books being separated into Tournament Legal and Advanced Rules. If some things have changed they get moved into the applicable book. I would also include things from AToW and it's Companion as some things don't have TW rules.
I can also see the Construction Books being separated into 4 books. One for equipment and three for construction. I'd also reorganize them so that everything is together instead of spread out. That way information is easier to find.
For the equipment books I'd include all the equipment from every book, even the equipment that wasn't included in IO. For the construction books, the first would be for Tournament Level Ground Units from TM, TO, IO and AToW+C. The second book would be for Advanced Level Ground Units, from TO, IO, and AToW+C. The third Construction Book would contain all the Aerospace Units from TM, TO, SO, IO.