Updated.
We still need trample damage. 6d10 like the crush?
We also need to fill in the blanks on swallow whole:
Swallow Whole (Ex): A reptilian gargantua can try to swallow a grabbed opponent of Huge or smaller size by making a successful grapple check. Once inside, the opponent takes
xdx+x points of crushing damage plus
xdx+x points of acid damage per round from the gargantua's digestive juices. A swallowed creature can cut its way out by dealing
x points of damage to the gargantua's digestive tract (AC
x). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out. A reptilian gargantua's gullet can hold 2 Huge, 8 Large, 32 Medium, 128 Small, or 512 Tiny or smaller creatures.
We also need the natural armor bonus.
The tarrasque's bonus is +30.
A great wyrm gold dragon is +40.
A force dragon is +49 when it first reaches Colossal size, while a prismatic dragon is +47.
Skills: 4 at 67 ranks
Jump, Listen, Spot...
Feats: 22 (15 can be epic)
Awesome Blow, Cleave, Devastating Critical (bite), Dire Charge, Great Cleave, Improved Bull Rush, Improved Critical (bite), Improved Critical (claws), Improved Initiative, Multiattack, Overwhelming Critical (bite), Power Attack, Power Critical (bite), Weapon Focus (bite) ...