Warhammer Fantasy and DCC are a good match.
I'll share my personal take on a DCChammer campaign.
I'd run this Warhammer + DCC game as a "re-imagining" more than a conversion. I'd take some stuff I really like about the Warhammer world and I'd leave out the things that can get in the way from time to time. The Skaven, The Empire, Beastmen, and Chaos are in; Schools of Magic,the organized human religions, and the empire's "canonical" geography would be out.
I would avoid the Schools of Magic and the Cults of the Empire because more than likely they'll work against the adventuring party's cohesion as a group. Why would a Priest of Sigmar loot tombs with a rat catcher
? why would a cloistered wizard from the School of Fire venture into the forest with a former toll keeper
? Priests of Sigmar and Magicians make all the sense in the world in the Fantasy Battles game, where they wield immense levels of power; they kind of don't fit in the framework of a low-level adventuring party, particularly one composed of lowly fighters and thieves. That's why I'd do away with both organizations. Wizards would either be cultists or backwoods witches. Clerics would be crusaders.
I would forgo of The Empire's geography because it's easier to just come up with cities and towns on my own.
Again, that's just my take on it.
I'd have no problem playing a faithful Warhammer conversion.
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