Just one thing Paul, about the color.
Please take in consideration that the color of the trikes was a kind of beautiful grey. It appears to be brown in that scene of JP1 because it's covered in terrain dust (like much elephants do when they rest).
There are not much reference pictures of it, but there are:
Besides if you make it brown, also the raptor head brown, the rex head brown, that would be the dino brown family. Everything brown. I think it's much more beautiful on it's original color
http://forums.stanwinstonschool.com/...io-triceratops
