Finally it's finished and fully based. Painted using the same scheme and techniques employed on my gargoyles and warriors, except for the use of Nurgle's Rot on his twin-linked devourers (going for an oozy mucus look on them).
Getting the balance of black and brown streaks right on his carapace was a struggle at first but I think it came out about right.
Basing was fun. I've added a number of mini tyranid bugs made out of random bits from the tyranid sprues and built a Hormagaunt fighting an ultramarine out of spare parts. Having already added the minibugs to my other tyranid bases, I have now gone back and added dismembered parts of Ultramarines to a few bases to give the army a unified look and also to add a little bit of story.