Proper Dino D-Day T-Rex?

Greetings!

I have been playing with the Dinosaur D-Day T-Rex model. It looks fantastic. Unfortunately, the mouth is not poseable. Would someone be willing to rig the mouth?

Link to the models: http://www.garrysmod.org/downloads/?a=view&id=83489

http://img341.imageshack.us/img341/9651/845931.jpg

Thanks in advance!

Bumpage: Would like to also add if it is possible to scale this model a tad bit larger.