Ok so I'm a little bit obsessed with the Lord of the rings and I eventually plan on forging many replicas from the films . One project I have in the works is to turn an old army surplus helmet in to a helmet of the fighting uruk hai. It seems pretty straight forward but I need help figuring out how to put a Ridge down the center of the helmet. It's a raised part that goes almost all of the way to the top of the helm. I'll post refrence pics of what I'm starting with and what i want to achieve any help would be great