BePe's platform rebuilder and updated kitchen make SYS and XIP porting a breeze.
The platformrebuilder and kitchen thread:
http://darkforcesteam.com/showthread.php?t=569
Videos that he put together to:
Build your initial rom kitchen
http://www.bepe80.com/test/1
Port a new SYS & XIP into the stock rom kitchen
http://www.bepe80.com/test/2
Best regards,
-boggsie
PS - If this falls under the automated tools category then have mindfrost delete the post