I'm surprised I didn't see this before dude 
Liking the "Primarch Vulkan" model, but wouldn't it more likely be Vulkan He'stan, the Chapter Master of the Salamanders, not Primarch?
Teeeeeecnically, Vulkan He'Stan is the Forgefather. He's just kinda that guy who's really cool with everyone, but the chapter mast is Tu'Shan.