I thought about telling you all the things you listed (as lessons from the last build) on your last post, but learning is a big part of the fun in this hobby. Since you asked for feedback, I have a few things for you. 
 Lets talk strain relief. Assume that you will crash, repeatedly. Any circut boards you leave outside your carbon frame WILL break in crashes (and sometimes the ones inside, if you crash hard enough). Make room for things to move a little when they crash. Antenna mounting: lash the antenna to the frame somewhere, such that the strain encountered in a crash doesn't get applied to the junction between the antenna and the board it is serving. 
 Lets talk skill gains. There will come a point where you aren't crashing every flight or three, and it's not necessiary to add the weight, or inherant cost, of an action camera stuck to the quads "forehead" like a unicorn horn. Maybe get to a point where you can intentionally fly in a manner that you enjoy, without crashing, for a few batteries before you strap expensive stuff onto the "danger zone" outside the carbon frame.
     The blue clips could be replaced with zip-ties (they don't rattle around and create gyro noise), or gaff tape. 
     I love that you made a quad that ran on power tool batteries, and if you were making something with bigger props, flown exclusivly with waypoint missions, it might still be worth your time. I know it's a lot of dead weight, but I love the safety factor, and the convenience as far as charging goes. I admit, I considered doing what you did when I was first learning about this hobby. I decided the extra plastic weight was too signifigant to justify the time investment designing a 3d printed adapter for quads to use them. I wish I had gone foreward with it, like you did, just for the satisfaction I would have gotten from designing the prints. I lived vicariously through your post, so thanks!
     By the way, your solder joints are VERY nice.
     Full honesty: your current build is packed so tight that you will likely loose several boards in a hard crash (concrete, asphalt, steel). On the other hand, your handling charistics should be stellar. 
     Those motors and ESC's are top notch! 
     Are you running ardupilot, or INAV on this beast? 
     I can't wait to see what you come up with next :)
     If this were my bird, i'd ditch the gopro & gps antenna. I'd get taller standoffs, mount the reciever in the frame, and print a camera bracket (since your carbon side plates won't work with the taller standoffs)
     p.s. Catalyst Machineworks will cut carbon for you.