I'm seeing which of your naval designs work with the Water Mod .
This one does not float. A pressurized air pocket or empty tanks under the landing pad would likely get it to float.

Little nice ship, but it has its weakpoints.
Made a modified version of it with many optimizations.
Like a heavy armor under the Hydrogen tank. They blow up every time in my tests on planets.
And i move the cockpit a little back to not sit direkt on a bomb.
Rerange the guns that all can shoot forwards, and so on ...
But the base is good.
Good Job!