Overall, nice conversion!
I like the 'heavy flamer' for the right arm. I think the only thing that is missing is the ignition spark. Take a look at the marine or
CSM plastic flamers, and you'll see the little bit at the end that holds the flame. If you add two of those (one to each barrel) of the flamer, it'll finish the look.
I like the faceplate and how you've incorporated it into the model.
I also like the paint scheme.
Now for the constructive criticism part
When I first saw the dread, it looked 'bare', i.e. it looked at first blush like a loyalist dread. There are too many flat surfaces on it. Breaking some of those up with more chaos doodads, chaos stars, chains, spiked railings (or just spikes) from the chaos vehicle sprue, would held to differentiate it.
As you mentioned, it doesn't look like a dread with two
CCWs, so this might be a problem if your group or game store is strict 'what you see'. Ask them before you make any huge changes.
Lastly, you might want to think about altering the left fist, which again looks like a loyalist fist (cause it is

). Using something like the forks from the old style
IG vehicle plow, or any other blade like bit to make the fist into claws, or make it a little more distinct.
I definately like the direction you're going, keep at it. And as you try stuff, use some blue-
tac (poster
tac to hold posters to the wall) to mock them up and take pics, so you don't glue things on and remove them later.
Also, as some inspiration, take a look at some of what jamsessionein is doing (granted, he used a
FW dread as a base, but he's a nutter

)
http://www.dakkadakka.com/dakkaforum/posts/list/274466.page
Granted, its loyalist, but might give you some ideas.