My biggest drawback is that I am just getting into Avatar, so I'm not so sure about the canonical accuracy. Balance-wise it looks good.

Only sticking-point I see right now is that the Soldier class is getting to be better than the other classes.

Noble: -1 Feat, gets access to new talent
Scoundrel: -1 Feat, 2 fewer talent trees
Scout : -2 +1 = -1 Feat, fewer skills
Soldier: -2 +3 = +1 Feat, no other drawbacks

Things will likely change as your conversion progresses, but for now the Soldier wins out at 1st level.