As a retired auto mechanic, disassembly was not difficult. The only parts I struggled with were a buried screw and a small cover over the battery. There are two tabs that have to be pried up to release the cover. The plastic tabs are not very forgiving. The cover snaps back into place. Once the camera is assembled the clips are redundant. The battery cannot move because the cover is sandwiched.
See my previous post about this.
The silicone cover retaining tab is not in any of those photos.
There is a thin translucent cover over the speaker that I had to destroy to remove.
The speaker grill the cover protects
Perhaps a piece of cellophane tape would restore the IP65 rating.
Closeup of the location of the hidden screw
Two views of the case showing the cover cutouts
If you need more photos let me know.