I'd like to ask if anyone's aware of the Aquatica housing being backwards compatible with the GH3? The GH3/4 bodies are by all accounts are the same, except for the taller mode dial on the GH4. Not sure about clearances inside the housing, but hopefully that wouldn't be a problem?
The paperwork says yes, but I would still like to physically try it before going official on this, we designed using the GH4 camera and did not have a GH3, this being said, as you mention, both camera share the same physical property apart from the mode selector dial.
I have put this on top of the "to do" list of the engineering department.