Hi Jeff,
The cleanest way to import the project to CodeWarrior would be to create a Bareboard project in CodeWarrior 10.7 and copy your drivers from the 5.2 project. I would recommend you to use the new linker file and startup code, just compare it with the ones in your previous project to make sure there is no need to make any changes. Also, compare the project properties to match the ones in your previous project. For detailed information please see this document:
http://cache.freescale.com/files/soft_dev_tools/doc/app_note/AN4727.pdf
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer