Some brake arms need to be bent...some don't.
On my last wheel I had to bend the arm...on my new wheel that I just got a few weeks ago I did not.
I shaved a little off the mounting bolts on the sprocket to help clear the brake arm just to avoid buying more bolts.
Some use flat head bolts, and some counter sink the bolts into the sprocket.
Trimming the dust cover is a lot easier and faster then enlarging your sprocket center. The link in the previous thread will show you what need to be done.
If some pics of my set-up will help...just let me know, I will be more then happy to post them. And if you really need help, we can make arrangements and I could stop by and give you a hand.