Two questions you always have to ask when putting together a homebrew ship;
How much fun is this going to be to fight against? Overpowered ships don't add to the game. Underpowered ships don't either.
Second, and the thing I don't really get about this Chronos-with-a-beam, what's it for? With it's date of 2262+, Crusade only, presumably- so it will be serving with the Hyperion, Omega and Marathon. What can it do that they aren't already?
As I read the Crusade era EA list, the upper end of the scale- let's not go there. White elephants in profusion. At the lower end, apart from a decent wolfpack aggressor, EA are missing a light carrier and a missile boat.
Raid is too big to wolfpack with. Scratch that.
Hull 6 and damage 18 says the Chronos is too compact and too heavily built to have the internal volume to make much of a carrier. Dedicated unit there maybe.
As for a missile unit, apart from being deeply worried by the Saggy precedent- and I haven't seen a fan suggestion that even comes close to that for overpowered- I have a strange idea.
Hollow out the turret mount- ditch the railguns- and fit a large set of an updated version of the racks on the Missile Tethys and Missile Hyperion, all other stats would remain the same, add Advanced Light Missile Rack, Range 20, F, 8AD, Super AP Precise Slow-Load, with the same bennie as the Apollo's- ignores slow loading until crippled. No missile variants.
It would be tactically different, it would fill a real hole in the fleet, it would probably be technically feasible. 2AD too many, or lose some of the pulse cannon?