A man made of scrap muscle & the steam engine’s imagination, white feathers flapping in each lobe for the skull’s migration, should the need arise.
This gives me a visual imagine of your typical intimidating stereotype. "A man made of scrap muscle" shows me he was a very stout man. "White feathers flapping in each lobe for the skull's migration" gives me an image of maybe feathers or some sort of hat that is around the ears.