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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"Far better it is to dare mighty things than to take rank with those poor timid spirits who know neither victory nor defeat." - Theodore Roosevelt
-USMC Corporal Hess Sherrod B:6/6/84 D:4/6/09 I miss you, my brother.