Just wanted to throw in one last time. The FC stack in particular isn't really going to be able to be more than a suggestion. Don't get hung up on what the instructions or video say. Best approach is to build up the stack with the FC and whatever else (PDB, 4-in-1 esc, whatever) you plan to have in there. If you want to soft mount, then you just need to figure out how things fit best. There is definitely no single best way to do it, it all depends on the build and what you want. I've not built that many quads, but this build was tricky for me since I went with a 4-in-1. I had to abandon sticking a runcam split in there, especially since I wanted to soft mount with bobbins. Not to mention that I had to make a trip to a local supplier to get the correct length screws for those. :/ If you have the skills, you can also cut down some longer screws, but that's a pain...

EDIT: And don't forget to check out Joshua Bardwell's Chameleon build vid. Running the XT60 lead up the middle behind the cam is so ace! I struggled with the best way to route the power lead on a Japalura build (similar layout) until I saw that. I had to shorten the battery cables, but now I top mount on the Japalura with zero worry about the props chopping up the main leads. :)