My Rocks are just 27 weeks old this week, too. Out of 17 Rocks, some Partridge and some Buff, that were hatched on the same day, approximately 1/3 of them are laying. There are some that are close and their combs are getting red, and there are some that don't look close at all. It's a very individual bird thing.
You might want to be prepared for a long wait.
Last year I had two dark brown Leghorns born late April 2011 and they didn't lay a single egg until June 2012. In fact, they both laid eggs IN THE TRANSPORT BOX as they were waiting to be picked up by a lady from Craigslist. I'd listed them for free since they'd never laid an egg. The woman was very nice and said she wouldn't take them since they had just started laying, but I sent them off any way. I just told her it was her lucky day.
You might want to be prepared for a long wait.
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