Yep, how to use a PowerBook LCD for anything other than running off the the controller on that particular LCD's connector on compatible PowerBook models used to be one of the common questions here and over on 'fritter back in the pre-LVDS day. The answer from Dr. Bob, our own Gorgonops (Eudimorphodon in his previous incarnation) and others who understood the hurdles, was that it "can't be done." This news for the the hacker's proposition was invariably softened with the caveat that it would take an amount of effort by someone with the training and ability to pull it off and, therefore, knew that it just wasn't worth it.
Kind of like changing the startup sounds and icons in the Mac's ROM . . .