Follow the directions in this post
http://forum.ppcgeeks.com/showthread.php?t=18330\
then just copy only the carrier files you need out of the OEM folder in DogGuy's kitchen to the new one based on the post above.
Also if you put a the attached file in the OEMAPPS folder then you won't have the blank white startup screen. The filename should be welcomehead.96.png