If the NN hasn't crowed, I would wait before doing anything. My NNs pullets hatched 3 June haven't laid yet, they can take up to 6 months. The only reason I think the NN might be a boy is the burly legs. My girls are mostly red and black, a common color combo for NNs. I had a boy 'for sure' that laid at almost 6 months. If you look at the pin feathers, if there are still any on the back, you should see really shiny ones coming in for the saddle feathers. My June hatched boys all have saddle feathers, even those that lost their tails to the pecking order. I have three boys that are tailless, and not due to space issues. Anyway, NN's can be really hard to sex, since their faces and neck flush and fade and often they don't crow because they seldom are high in the pecking order - their personalities are too laid back. Post his pic on the NN/Turken thread, perhaps they can tell the gender better than I.