Heck yeah, awesome killerbot you have there. A bit of a Necron vibe with the Choom, but not bad! Going to steal some of your ideas.
Has any further progress been made on Nakir?
At the moment I have been trying to find the best colours for the robes and tabards as I am not sure bone robes/tabards work too well in my force or it's just me, so for the time being I have kinda paused any further progress on him.
I had the same issue. It took me a while to figure it out, since I've tried red, green and bone robes. I find a bone robe with dark red liner works well for me. When you start including green on the model it starts to fail though IMO. Pick two of the three colours and stick with it.