Ensure cables are disconnected, screws are out. The dGPU board should slide out pretty easily

You may be able to remove the dock cable without removing the hinge, however I removed the hinge by unscrewing the 3 black screws on each side, for a total of 6. (Torx TR8)

To remove the Dock cable you will need to remove the metal sticker with model information covering the screws holding the cable in place.

Remove the screws from the dock cable and it should be fairly easy to slide out. (Torx T4)