I have a character (The Akizuki) which pilots a Kusari Luxury Liner.
I agree completely with Drake about the maneuverability issue, there is no denying the fact that the Kusari Luxury Liner is shockingly agile for being just a Luxury Liner, but if it were to keep its original armor value of 75k, then it should still possess a significant agility compared to the Yacht because the Yacht has 175k armor.
100k armor is alot but yes I still agree upon a slight nerfing on the maneuverability of the Kusari Luxury Liner.
The Kusari Luxury Liner should also cost more, perhaps around 40-50 million credits.
A size change should not be necessary as both the Yacht and the Kusari Luxury Liner have about the same size.
Then it leaves us the the weaponry issue, which has two arguments that contradicts each other. First argument is that the Yacht is supposed to be a ship made for high (almost pure) roleplaying. Meaning that it should cost alot, have a really nice design and possess decent capability for trading so you can actually perform something with the ship. It should carry low weaponry functions because its original purpose was not for fighting, however it should still require necessary defence capabilities.
The second argument is that the Yacht's weaponry functions require a boost since the Vessel Description Card says so and that it will get frequently pirated which require more defence.
Personally believe that 4 Train Turrets and one additional gunboat turret is not that reasonable compared to the Kusari Luxury Liner which has 7 Train Turrets.
So the Kusari Luxury Liner has: 7 Train Turrets
And the Yacht has: 4 Train Turrets + 1 Gunboat Turret
Now comes the question: Does one Gunboat Turret equal to the power of 3 Train Turrets? Certainly not so we have three choices:
1) A reasonable weaponry nerf to the Kusari Luxury Liner. E.g. looses one Train Turret or fewer Turrets are able to fire backwards like Mjolnir suggested.
2) A reasonable weaponry boost to the Yacht. E.g. one Train Turret slot becomes a Gunboat Turret slot or one extra Train Turret.
3) Ignore completely the weaponry differences and balance the other issues such as the maneuverability problem. Also an acceptance to that everything dosen't need to be exactly the same.
Another thing, a Cruise Disruptor isn't really logical for a Luxury Liner, a CD's only purpose for capital-ships is to stop an opponent. Piloting a Luxury Liner shouldn't be about pirating others let alone acting hostile.