Models you should add (imo):
Also, for a ranged threat warjack I really like Dynamo. He gets a lot of work done when shooting at hard targets. He's another great one for Jakes to have on her and a good target for Snipe.
With Maddox, I like Sword Knights. She makes them ARM 17 which will protect them from most blast damage since they're frequently bunched up, and gives them Tough which is great because when they're bunched up they can't be knocked down.
Tempest Blazers might be good with her, too. They'll get a lot of work done with Snipe on them. If you really like cavalry it might be a good idea to start with one unit of storm lances and one unit of murder ponies.