This ship can cross it's own engagement range in five seconds. This means if it loses inititative (moves first), it will close to point blank, then the target ship will move away 75,000 km or so and the Kennedy will be unable to fire. You want a much bigger plasma carronade at this speed.
It looks like you grabbed all tech that costs less than 111,111 RP or something, and then tried to design a ship using that. There's nothing wrong with such an approach, but it tends to produce ships which would never arise organically since the next 200,000 RP are better spent on going faster or hitting harder, rather than two borderline useful EW or efficiency or fifth-or-sixth direct-fire weapon techs.
Which is why designs like this (or Xenoscepter's) attract the same criticisms every time. (Such as: the sensors are too big, the electronic hardening is not needed, the engines should be boosted, this tech is a waste, that tech is too expensive, etc.) Frequently, the post "Check out my gun cruiser for long-term independent missions" gets the reply "Replace the guns with missiles, offload the sensors to a scout, the fuel reserves to a tanker, add a collier to carry replacement missiles, and a dedicated jumpship to move the whole squadron."
- - - - -
So, most people trying to simulate a PT boat would use a FAC hull (i.e. 1000 tons, no bridge) and a big, overcharged engine (PT boats were faster than cruisers, after all) and minimal sensors & fire control (just barely enough to cover the range of the gun (or torpedoes)) along with two or four box launchers (the torpedos) or one big gun (which the Commonwealth would call an MGB rather than MTB, but Americans can't name things logically).
Since PT boats weren't designed for (and almost never* launched) beyond-visual-range attacks, I wouldn't give the Kennedys actual sensors. I would make them rely on some other platform to spot & track targets. I'd use torpedoes with active sensors before I'd put sensors on the boats.
I like the CIWS. To me, it's the deck machine gun(s) that are basically useless against enemy naval units, but could be used on mines or kamikazes. If you want to use them to shoot up commercial shipping or ground units, reduced sized (1/20th, 1/10th, 1/6th, etc.) gauss cannon are a better choice, but need a beam fire control system.
- - -
*Okay, the boats laid a lot of mines, which technically counts.