I made a 20ft long Mirounga leonina, or Elephant Seal for the Life At The Limits exhibit in 2015.  Starting with a clay scale model, I used a 3D scanner to help me map out the steel armature and wooden gussets I would construct.  Using chicken wire, foam, polyester resin, fiberglass, and epoxy, I fleshed out the body of the seal.  The head was sculpted in clay and cast in polyester resin.  The model comes apart for travel, and can be mounted on a post from the floor, or hung by two eye hooks on its back.