Step 1: Forming the Skull
A godzilla/tyrannosaurus skull is formed from box cardboard. Two upper jaws, two lower jaws, and a 2" strip across the back and top, and a strip down the center top skull to the nose, and one running across the upper jaw and the snout. This is too coarse a lattice to lay paper-mache on (it will be too blocky), so a lattice of 1" masking tape forms a tighter grid.
The components are glued together with hot-glue (best) or white glue (and then staple the pieces so you can work immediately). I found staples were not enough to keep the skull stable.