Independent Innate Attack

[Shaun]

Please check me on this,:

I have an Innate Attack.
I get an Extra Attack, Single Skill (Innate Attack).
I give that attack Independent at either the 40%, or 70% level (you tell me which is appropriate).

Now, can I opt to use this independent attack as a parry?
If so, can I also attack in the same round, or do I have to choose between attack and defense?
If both, then do I apply the negative modifiers for multiple attacks/parries in one turn, or not since it's independent (maybe not if it's at the 70% level)?

If this build can't parry, how do I go about building a Point Defense System? Even better if it can attack as well...

Thanks.