I'm assuming by looking at your list, you think your opponent is going to ignore your boomguns/loota's in favor of killing your Nobs?
I like being able to field Nob Bikers as Troops too, but this unit is going to suffer as it will attract a lot of attention, and rightly so.
But you only have 3 scoring units, and the armor 11 as has been said isn't going to last long and with the increase in the amount of terrain at most shops/tourneys I think keeping your assault rokkts would be a better idea - especially since your troops are fearless. I'm a bigger fan of the 4 Big Shoota Battle Wagon myself.
Bump up your shoota boys to 30 man squads, add rokkits. If anyone is stupid enough to get into assault range of Furious Charge orks, then they get what they deserve.
Not a big fan of Lootas myself, as you could field two whole more units of shoota boys giving you 15 rokkits per turn and two more scoring units.
Your opponent will certainly have some deployment issues as you can set this up "WIDE"