I finally figured it out, so i thought i would post a guide on this, since it's very hard to get a glimpse at what is wrong from the outside.
Firstly a pic showing the interior of the dock after a metal cover has been removed. Yup, the PSU section is not shielded from the other parts of the dock.
To get to the fan you will need to remove the main board on top, a few screws holding the metal base to the plastic bottom, and them lift the metal base upwards.
Now onto the part about assembling the dock with the top cover near the lock.
1.
So, after reseating the metal cover again and remembering to reseat all the screws again, before beginning to push on the plastic housing again, check that the plastic part is locked onto the slot in the metal part. These parts are not held together permanently before the top cover is completely mounted again. Tilting the dock sidewards when installing the cover can very easily demount the plastic part from the metal part, and typically the dock can be easily assembled either way, because they don't interfere much with the top cover.
2.
The lock section is shown on the pic. See the brown tape? This part of the metal is the root to all frustration. What exactly the point of having it is apparently stability, because the whole lock section is held by two screws in the plastic bottom.
The plastic spike is where the spring mounted in the undock "2" button goes to. To make life more irritating, the spring isn't glued onto the bottom, it's merely plased in a round hole.
3.
Here's the underside of the dock top cover in the undock/power buttons department. The PCB is for controlling the docking/undocking lights, buttons etc. The cable goes to the mainboard on the dock.
The bruised white spot of the PCB is where the brown tape section of the lock is hitting the PCB due to the fact that the plastic on the side automatically pushes it inwards when mounting the top cover. Thus taking off the top cover isn't as tricky as reassembling it again.
The brown tape section of the lock should have been to the left of the lower screw in that pic.
I don't have a pic showing how to mount it inside the slot where it should be, but you'll need to mount the cover as much as possible on both sides. Mounting it from the top is the easiest. Remember to mount the spring on the spike, and then use a flat screwdriver from the outside, point it upwards in the plastic hole and push the metal part with the tape towards yourself, using the outside plastics as a counter weight. Then the top cover will slide on.
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