I just looked over the uber section a bit. Kinda disappointing.
1: You could at least tell the reader what's important for certain ubers (like: get hit by one sidemob in Horazons Sanctum for the invulnerability buff) and what to watch out for.
2: Why are some ubers written in a certain color? I honestly didn't get what that's supposed to show.
Then the challenges: I would also write more about what's important with these challenges. Else your guide won't be any newbie friendly. People are lazy and want to find all the information they need in one source. So if they are following your guide they have no information about LC1 and LC2, maybe try it and get pwned instantly. At least tell them what they need to do to fulfill those challenges and write a short describtion since you didn't mention them at all.
I'd love to see your build in action. A short video montage with different farm ubers might be nice to see the killspeed and to be able to compare it with other builds.
Anyway, keep up the good work.