The photos are of various P3 and a P2 gimbals or bits of gimbals but it looks like the casings are all rather similar.
After removing the camera/gimbal assembly from the drone I think the dismantling sequence is as follows
1) remove screws marked 2 & 3 (TINY and short) then carefully remove the horse shoe shaped protector which fits around the shaft/spindle and ribbon cable.
2) Open the back of the camera and, at a guess, disconnect the ribbon cable, BE CAREFUL, it might be stuck to the board with double sided tape etc.. This probably gives access to the screw marked 6.
3) Photograph but DO NOT REMOVE screw 6 so that you know which way it fits relative to the camera body etc.. Unfortunately it seems I didn't save the photo I took of this when stripping the gimbal of a dummy drone so I can not say which way it goes.
MARK the 'fly wheel" of the pivot so that you can reposition it correctly later. As you may see it seems possible that the spindle can be assembled '180 deg out' of position (or at least it could in the dummy I stripped) and I do not know if this matters. I had assumed that the camera would have been keyed in some way so that it would only slide over the spindle in one position but this was not the case.
4) Remove the screw marked 6 which holds the camera on the spindle and the camera will probably slide off the spinde. (I stripped a dummy which had no ribbon cable or camera innards so I am guessing concerning this. I am not going to dismantle an intact camera.)
5) remove the screws marked 1, 4, 5 & 7. ..... 1 is tiny and short, 4, 5 & 7 look at a glance to be the same length as each other but 7 is thiner than 4 & 5.
6) the "cover" should come off exposing the board.
7) carefully lift the board and release the the ribbon cables as required from the back of the board. There are two connectors so I assume two ribbon cables but the 'intact' gimbal arm I dismantled only had one ribbon cable present and that runs into the actual motor. I presume the second connector is for a ribbon running up to the top board or into the camera, you will haveto 'work this bit out for yourself'.
Relative to the gimbal assembly as a whole, the camera body can be reattached to the gimbal only one way as there is a notch and key travel limiter.
I hope this is of some use.