While you are of course welcome to use any miniatures you own in anyway you seen fit in your games, personally I don't think it works.
I've noticed that many people these days don't seem to realise the SC Dreadnoughts belong to the forces of Chaos and their design evolved from the Rogue Trader era Dreadnoughts (with more that a little influence from Ed209)
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~The ravings of a single mad Goblin is bad enough, but such a power-hungry, malice-filled creature as Mortis can never hope to be understood~