Yes we are! I certainly don't mind giving an opinion if you are stuck on something. That goes for anyone in our guild, if you want some feedback from me specifically, you can ALWAYS PM me. I am pretty good at getting back to people.
I know some people don't want to taint their "wow" moment so if you don't want feedback from everyone, and want to keep the build out of the lime light until it is ready, you can always PM with some advice on just a certain aspect. I know I have both asked for advice and given advice that way and I think it has worked out well. Keep in mind your PM space is limited, so don't abuse it by PMing 15 people with the same question.
If you want general feedback, Rolli is right- place your stuff here. Like I said above, PM space is limited and adjusts according to your rank, so don't abuse it! If there is a particular thing you are working on, then I would certainly say you are seeking advice on that aspect for more direction.