Bow Critical Build Skill Tree

Hello there guys,

I am new in this great game, and so far I have not found a tested-"heavy" Critical based skill tree. So I made this one:

and I would really like your opinion on this, since I have not played till the end the game and I have no idea if:
1)I can survive with this build in Late Game
2)I need a specific gear to support it or if a "descend" gear is enough
3)A shadow class should shine more with this build
4)I need Frenzy nodes or not
5)Gems like Critical Weakness, Increased Critical Damage, Increased Critical Strikes are "most wanted" for this build

So, please be free to write down your thoughts.

Thanks in advance.