While diving with Reef Photo at the Blue Heron Bridge recently using a rental GH6, I discovered that there isn't really enough room between the camera and a Nauticam housing for the internal HDMI cable. I had to shave some of the rubber off the connector to get it to close. I made sure that Reef Photo knew about it, so they could talk with Nauticam about it. I am not sure if there might a "low profile" connector or something that might help, but it will probably also be an issue with the GH7 since it uses the same housing.