Should include instruction to wedge thin paper one every side of the trackpad to keep it aligned during reinstallation. Without the wedges, the trackpad would come out misaligned, which might damage it from excessive friction. Kapton tape might also work, didn't try it though.

These instructions were standard for Unibody models in the past, don't know why it wasn't included here.

Mine is the Cyberbuypower rebadge of this model. And you only need to remove the two keyboards screws on the bottom. And then the top button board (called outer cover here)

Even here I don’t see why you have to remove all those screws.

“The upper screw goes through the metal bracket then through this plastic spacer.”

doesn’t the screw go first through the shield, then the speaker, then the spacer then the bracket? The wording here is confusing.

are you sure it's long, short, long. From what it looks like, it's long, long, short.