When reassembling be sure the camera cable is tucked into the case at this point. Otherwise it will end up on top of the cable bundle and be too close to the bottom case lip.
I bought a used replacement case and had to move a few parts from the old case to the replacement. This included the battery indicator cable, the clips for the trackpad and the bracket in the center of the top case. So worth it at this point to compare your old and replacement case to be sure everything you need is there.