If you knew where you got the screen it might make finding drivers easier.
i.e. what brand of equipment was it mounted on.
What chips are on the agp board...what brand is the card...is it a custom cable to bring video and data to the screen for the touch pad...or is there a separate serial cable connected. Is there a separate board on the LCD panel with the touchpad controller on it?
Have you searched here for Saturn installs?