Here is an awesome mechanical dinosaur costume that easily turns heads. Projector Raptor by Esmée Kramer was built with PVC pipes due to their price and weight. The head can move up, down, and around. As explained on YouTube:
The way the costume leans on my hips/shoulders kindoff functions as a seesaw in which I am the fulcrum. This way I don’t have to move my body a lot in order for the dinosaur to lean forward or backward.
The pose can be adjusted by pushing or pulling the handle that controls the head. The tail has two inflection points and can be swung by moving the body.