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So, independent skills cost 2 skill points to learn, but don't consume knowledge points, right?
Yes.
Without access, does that mean they can't be obtained? But the cost to learn still remains?
Yes.
And how do skill bonuses interact with each other? I seem to remember that weapon skills didn't stack.
Any weapon can be used without specific penalties, but only one style bonus applies (the only exceptions are the Drearian skill, the Traveler skill, and the Officer skill).