NC has only selected 39 delegates by district. Of the 39 there is only 1 declared Paul delegate, and two alternates. The preference primary determines how the Paul'ers are allotted for convention.
30 more delegates will be voted on at state convention. 3 of those are RNC members.
It looks like we will get 5 delegates in total, maybe 4. I'm not sure if the two alternates can "move up", or if the state party needs to hunt for people to stand in and vote for Paul.
Vernon Robinson from 5th district is ostensibly a McCain delegate, but I think he'd "flip" to be a Paul delegate.