Oh am I your best friend. This is the panel from the Gateway m275. I have one myself and I am going to try to wire it into an ibook as well. The ibook g4 has 2 different cables available for it. The second version, shipped with later models is a 1.5" 30 pin and fits this panel.

http://www.macrecycling.com/display-data-lvds-cable-ver-ibook-g4-14-p-100648.html

I also have the serial pin outs for the wacom panel itself, which you will need to adapt to usb and run tabletmagic as the driver. Get the LVDS cable from the gateway as well as it has the little connector you need to attach to the tablet.

[attachment=0]<!-- ia0 -->WacomPinout.pdf<!-- ia0 -->[/attachment]