When assembling, these might be nice to know. When placing the big rumble motors, place the plectrum in first so it just slides in.

When the daugtherboard is placed back in the chassis, check if all the buttons work(except B that goes to the motherboard).

(It took me a second to find that my Y was dislodged because the controller was resting on it, that meant I couldn't press it and couldn't pull the RT all the way down, so I had to go back some steps).

When putting back the D-pad ring, make sure the top is sitting deep enough or you could run into trouble.

When placing the wires back for the trigger rumble motors... just put on some good music and try to keep you patience.

Please when you are almost done and only need to put the side plates (step 2) check before finishing if everything works. You can easily do this using this link https://gamepad-tester.com/