i just had a read up on you thread on the build progress.
you mention over there that about removing the hdmi port. it shouldnt be to hard to do if you can remove the solder from the four pins going through the pcb then either hot air or drag soldering the iron on the hdmi pins topside should allow you to remove it without much effort.
rather then running a full size hdmi cable throught the powerbook back to the lcd driver board depending on your soldering skills you might consider using a ribbon cable and either soldering on a flat flex connector or just soldering the ribbon cable directly to the pads..
ive used something like whats in this link below this to do just that in the past.
the kit i got at the time the flat flex cables had one extra pin but the pin pitch was the same as the HDMI pads on the circuit board so i ordered some of the same flat flex connectors and on the board i was installing them i just scrapped away some of the solder mask on the top ground plane to solder the connector anchor points down