Any chance of a chaos light cruiser variant a la the IN defiant class? Maybe trade the torpedos for an extra wb point of strength and up the speed by 5cm?
Now ask the question: why?
It is all to easy to create copies of IN and Chaos vessels within the opposite fleet. But I think both fleets should be different. Hence the IN with its NC/Torpedo/Prow aspect and Chaos with Speed/Launch Bays per example.
This is also why Chaos never had CL's in the first place: to have differents fleet.
And now with the Rogue Trader or allies rules you can build a fleet having a CL in a Chaos fleet or similar. But just not as a Chaos vessel.
While I'd agree for the normal playlists, the point of the additional ship's compendium is to have vessels that people want, not that are necessarily there for game balance. Since the Pagan exists in the Book of Nemesis, there is no reason it should not be included here to allow someone who lovingly takes the time to build one the ability to use it. Sure, it is not that "Chaosy" of a vessel in terms of fleet design, but in the whole of the 40k universe and in the 10,000 years since the Heresy, there easily could have been a handful that did exist. Thus to me there should be a way to use, though it should remain here in an unofficial fan made fashion.
Basically, all the ASC ships are this sort. Not official and for fun play only. If you as a player don't want to play against someone using them, that is fine. They aren't official. But in a one off pick up game for the sake of getting a game in, there should be no reason to limit your opponents fun. If a Carrier variant CL is what is fun for them, then why not.
But they should be slightly different and not exact copies for flavours sake