The speaker cables are routed under the logic board, or at least the right-side one is. I found that if you can undo the fastenings on one side of the logic board you MIGHT be able to lever it up and work the speaker wire out without taking the entire thing out.
The video doesn’t seem to be aware that the two center battery packs are glued, too. Was there any trouble working around the plastic frame when de-gluing these? And did you have any trouble with the track pad?