I see no big fault with tis list, but i still have some advice.
Razordons loose out to sallies but since you have both its ok.
Engines are still ok this ed altho having a single monster in you'r entire army is kinda cannon fodderish (literally).
Cold ones and terradons are great warmachine hunters and flankers, but camo skinks could handle warmachines while you get more saurus.
As for the Slann, if he's going solo he needs Higher State (etheral discipline) its the law of the lustrian jungle
Otherwise he needs temple guard, in which case lore of life would be better too.