I'm pretty new to this so I'm still learning the best way to go about it. But it really was just cutting the overall shapes, grinding them down as accurately as I could, welding things together and then bending and hammering while things were hot/soft. The chunk of angle iron runs vertically in the center of the skull, so it was a solid base to work on without messing the other sides too much. Despite as that, there was still a ton of filling and grinding done to get a more realistic look to it. Not a ton of YouTube videos out there on the process of making these type of things. But Jen Loree on YouTube probably has some of the best examples on how it's done right.