These look unusually solid for a first-timer. My complements. That said, there are some issues to be worked out.
Most importantly, thickness 2 armor is a joke. Either go with thickness 1 and expect to lose any ship that gets hit, or get it up to 3 at an absolute minimum. I try to have at least 5 layers of armor on my main-line warships.
A CIWS with only Gauss fire rate 2 is pretty bad. In fact, I generally recommend staying away from CIWS in general on smaller ships. I'd recommend a real turret and a 1x range 4x tracking speed fire control. It won't knock down as many missile, but it has two important advantages: it may double as a respectable beam weapon for knife-range fighting (depending on what kind of turret you use), and, more importantly, it can cover other ships in the fleet. If you're operating in groups of similar ships, beam weapons are always better than CIWS because, while each ship can't shoot down as many missiles, every ship can fire on every incoming volley instead of only the targeted vessel. For a single behemoth CIWS is better, but for fleets of small ships, real beam weapons all the way.
Do you really only have missile fire rate 2? Get that up to 3 ASAP; a 15 second reload time on your countermissile tubes is terrible.
Your PD radar and fire control don't have enough range. They'll detect a size 1 drone at a decent range, but most missiles are smaller. A missile smaller than size 6 (0.3HS) is treated as being size 6 for detection purposes, so you need to design your antimissile sensors accordingly. Your range 1.4mkm radar can only see most missiles at a range of around 150,000km, which is far too short for a decent countermissile envelope. Ditto for your fire control. It's plenty for any PD beams you have, though.
That big EM sensor on the Victory probably isn't doing you much good. As tight as space usually is on a ship this small, I'd use a size 1 sensor at most.
General advice? The Agincourt looks to be a far more capable vessel, both offensively and defensively. It has nearly as many shipkiller missiles as I'd expect the Victory to carry, way more countermissiles, more countermissile tubes, the same sensors, the same speed, more armor, and with box launchers, it can launch as many shipkillers as it wants in one massive salvo. If you want a missile combatant with more staying power, I'd say it needs at least ten salvos of offensive missiles to be worth using normal tubes instead of box launchers. I don't think you're going to be able to fit that in a 6,000 ton hull without making some serious compromises in other areas. In my current game, I've got a destroyer that does offensive missile/countermissile/PD beam triple duty like you're trying to achieve with the Victory. It's 9,000 tons, and it only has four size 4 launchers. (Works great when I've got all nine of them together, though.)
