Since my standard gimbal which came with my P2 Vision + appears to be totalled I am looking at getting a Zenmuse H4-3D replacement gimbal to hold a Go-Pro Hero 4 black. Three questions: 1) Is the gimbal easy to fit to a standard P2 Vision +? Does it mean messing about in the drone's casing or does it just screw on and connect up the cables? 2) Do I get to see the POV of the go-pro on my phone via the DJI app like I did with the standard camera? 3) Do I have to get a Go-Pro or will any cheap action cam of the same size work just as well? Thanks!