This is what the displays original cable should be: http://www.ifixit.com/iBook-Parts/iBook-G3-14-Inch-Display-Data-Cable/IF151-023

This is what your iBooks original cable should be:
http://www.ifixit.com/iBook-Parts/iBook-G4-14-Inch-Display-Data-Cable-Wide/IF184-053

Since you still have the iBooks original cable, you should try to find one off of a G3 so you can either modify that, or merge the two.

I did find that this has been done before. Not having the same to look at it's a little hard to follow, but you may understand better. http://www.applefritter.com/node/8880
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