I would like to see Abbie filled out more in the hind, as she seems somewhat short in the hip, but that may come with age and work. Stormy has more structure especially in the hind, but is built downhill so he may have a harder time pushing the cart. But like has been said, temperment is WAY more important than conformation for a driving horse unless you are trying to win big time.
I also agree that age is a benefit, not a detriment. You can start groundwork if you haven't already, but I wouldn't push a whole lot just yet.
Myrna