This is absolutely amazing! I have never seen that furring technique before. Did you pre-mount the lower teeth on a plate, slip it in and cover it with the tongue? No one who hasn't tried it can know how frustrating that operation can be! What is the scale?
I feel presumptuous about offering any suggestion, but since rodents have such glittering eyes, could yours use another coat of varnish?
Thanks for sharing this with us!