Caw FAQ's........Links to Tutorials, and Resources. Textures, & Troubleshooting

I haven't done the process myself yet. I've been planning on doing it with the world I'm working on, but I haven't even read through the entire tut. I would suggest you find someone who's actually done it. Kiwi Tea would be my first choice since he figured out how to do it.

Try reading, and posting your questions on this thread at MTS.
http://www.modthesims.info/showthread.php?t=403303

Sorry I couldn't help more. :-)