Well first thing i thought of is the Bosspoles on the warbosses are something I'd drop, since you already have a bosspole in the nob squads, and there are scenarios where a warboss breaks off of a squad of nob bikers to take out some vehicle or something.
The other thing I was thinking off, that it probably would be better to drop the battlewagon and the ard boyz for two trukks full of regular boyz.
Yes they are less survivable but you get double the amount of boyz in a fast vehicle
Or the other option is to tweak the battlewagon and put in a deffrolla and a bunch of big shootas, and then fill it with regular shootaboyz, so it can run around shooting people and tankshocking, But a single battlewagon gets gunned down really fast in any scenario.
I can see that you are going with a "go fasta!" tactic so the stormboyz should do just fine in this list,
But this being said I would look into adding some Big Gunz (kannons) and/or Lootas instead to add some supporting fire and a way to deal with Armor, since the only way you can handle armor above 10 is to claw it in
CC
In any case it is an awesome Elite-like list
Keep the Waaagh rollin' !