And here are the inner workings, laid bare at last. Note the two dual heatpipes, very necessary for a machine of this type. Feel free to remove than fourth RAM module you couldn't get to earlier. The boxes indicate motherboard connections to disconnect.The two with black cables have a thin layer of plastic adhesive holding them in place. Pull this up and pull the connector straight out.

Second image. Here we have the fan for cooling the CPU. It is secured to the bottom enclosure by three silver screws. Remove them.

Third image. GPU fan here, and arguably the most overworked piece of hardware in the whole machine. Remove the indicated screws. The cables running along the right side here are for the wireless adapter. Feed them through the hole in the motherboard and place them out of the way. We're about to remove the LCD panel.