Taking the body and one arm from the Goliath kit and then the head, chest plate and another arm from the Khorne Blood Warriors in the Age of SIgmar Starter Set, we were set!
Keeping the palette very restricted, it's metallics, black and red, with a touch of green for contrast!
It turns out that GW are coming out with a Khorne Cultist list, so look out for Forge World conversion kits next year some time on would think!