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A head swap would indeed be in order as well as some filing and GS to smooth out the boils and blisters and to steer the model away from its Nurglyness.
I'd also consider replacing the limbs with Tyranid ones but the present limbs could still work.
And for bonus points, a couple of well placed Tyranid carapace bits, perhaps on the abdomen.

Anyway... that's my vision for them ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/526016/5598956.page http://www.dakkadakka.com/dakkaforum/posts/preList/526016/5598956.page GMT