I have not any experience with Nauticam's housing for external recorder because I didn't buy it yet (here in Russia it may cost me around $5000 for housing itself) for a reason I described - it can not record 4K60-10bit with native cable they provide, so it does not make any sense to use it until Nauticam get fixed their 'cable issue' in the factory but not DIY.
I had a long conversations with Nauticam's guys with no luck.
Or I have to find a way to replace HDMI (A-A) cable to high speed one with an adapter, nauticam's hole is not big enough to put HDMI-A (Full size) connector through it.
For this moment I just have Atomos Ninja Inferno and GH5 and NA-GH5 housing and use GH5 without an external underwater monitor.
I have an experience to use different HDMI cables with GH5+Ninja Inferno in my studio not underwater.
So both (Atomos) cables I have are quite expensive ~$150 vs $50, and $50 cable does not support 4K60-10bit, but 4K60-8bit does.
The $150 cable is OK
I have two more chinese s**t cables I bought at AliExpress for my experiments and they just don't work and show me black screen.
Also I have complains about another issue that Nauticam has and doesn't want to admit and fix - TERRIBLE reflections in conrtlight from shining black surface that covering their DOME.
I described it here: https://www.facebook.com/VitalySokol/posts/2112898938741028
For now I use black velvet to cover backsurface (such as SeaCam's domes have), but I have to find good material and replace my old solution - it showes me black corners in 7mm focal length.
To Panasonic as well =)))