Pam & Mike, I'm sorry for sending you on a wild goose chase. A year ago there was a very detailed website from a Southern Cross participant on the web. She had the daily miles and stops listed from Disneyland to Disneyworld. It appears to be gone now, as does Tim Kneeland's site.
If I remember correctly, the Southern Cross route veered off the Adventure Cycling route by staying on US 90 into and out of San Antonio, by going south of Lake Pontchartrain in Louisiana, and by following US 90 in the Florida Panhhandle until turning south to Orlando at St. Marks.
An alternate route that I recommend is to head east on US 70 out of Safford, AZ to Lordsburg, NM. You can take I-10 from Lordsburg to Las Cruces, where you will rejoin the Adventure Cycling route. By doing that you cross the Continental Divide at 4585 feet, and avoid the Emory Pass at 8228 feet.
Thanks for buying the book, Pam. If nothing else, you'll at least learn where NOT to cycle in Louisiana. Have fun planning the trip. You'll have a blast doing it.