I've been working on a similar mod (installing H3-3D on a Phantom 2 Vision) and have run into a number of problems. First, the yaw axis motor did not have clearance so I had to 3D print a spacer. You can find the file here:
http://www.thingiverse.com/thing:325877 With the new spacer, I was able to attach the gimbal to the P2V successfully.
The second problem is that there is no ribbon cable to connect the gimbal to the Phantom's circuit board because there is supposed to be one already inside the Phantom's case as the gimbal is designed to work with the Phantom 2, not the Phantom 2 Vision. I fashioned my own 8 pin cable from junked computer parts and was able to successfully plug into the interference board (which was plugged into the zenmuse gimbal).
also, I unplugged the three wire cable that used to plug into the stock vision camera from the P2V's circuit board, but did not unplug the thick white cable (that looks like a headphone jack). It is still connected to the board, but not into any cameras or gimbals.
Currently, the gopro is getting power, the Phantom spins up and will likely fly. The problem is that I don't know how to get the camera feed onto the iPhone app or other FPV system or control the gimbal movements!
MY QUESTION IS: Has anyone successfully done this exact modification (H3-3D to Phantom 2 Vision)??? If so, where are the tutorials???? Someone please link me one. If this works, I will be sure to make a step-by-step tutorial to share with the community!
SECOND QUESTION: I realize that DJI is closed source company, but does anyone have schematics for the P2V and/or the H3-3D??? I'm not an Electric Engineer, but know a bit about circuits etc. and would benefit from reading that kind of thing.
please help! Thanks, Fletcher