Cute little thing, but I do think the gas turbine is overkill.
Since this ship most likely will spent 99% of its time puttering about at 10-15kts I personally believe the volume and weight would be better spent on fuel and living space.
This will give you greater range and endurance (Not the same thing) which is arguably the most important aspects of a patrol craft.
In order to reduce ice build-up you should consider rounding the deck edges.
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“Close” only counts with horseshoes, hand grenades, and tactical nuclear weapons.
That which does not kill me has made a grave tactical error
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