i dont understand what you mean about kashtan penetration deck ?
Most weapon systems are like Icebergs, you see only a part of it and in most cases that smaller part. Deck penetration means how deep in to ship that weapon system go, deck, two ?
and that's not a kashtan but palma,i discribe it as a rectracable open\closed close defense system,so the stealthy can be maintained,when palma used,the door opened downward and became the footing for palma,thats why on pict i drawing the right side opened the palma and the left side discribe closed palma
Ah you right, I was too tired and my eyes start to play tricks.
That's indeed Kashtan/Palma ( Palma/Kashtan?)
But it's still just to heavy to be use in that way, Kashtan weight was something almost 16 tons ? Palma version is probably lighter, 13-14 tons ? And the deck penetration of this CIWS is big. Maybe try to use some AK-630M-2 with low RCS turret, 4 of them would give you a better def options then 2 Kashtan/Palmas.