Heya,
I haven't any experience making Chaosy Necrons, but I do convert necrons and chaos into my orks. To create Chaosy - crony - Orks!
So is it possible? hell yeh! Nurgle would have been easier (but that's just because nurgle is like the easiest converting the world has ever seen). For daemonkin, you could very easily turn your barge into stuff like the soul grinders etc...
So how about a brainstorm to start off? (assuming you actually like to play the game also)
Khorne fleshhounds are a good unit, you could sculpt some necrons into dog shapes - Torso's become ribcages placed horizontally, you can snip arm joints to place the arms into a more traditional 4 legged pose, then maybe sculpt the face? placing a scarab in the head/brain area to help indicate its robotically controlled?
Bloodthirster, giant robot bloodthirster, using a tomb blade you could use the cresent shape to create the head of an axe or something
Some great d