I just harvested 15 week old extra cockerel, he was delicious, young enough to grill after a few days in the fridge.
This is the best butchering documentation I found. http://ramblingredneckmom.blogspot.com/2011/04/how-to-process-chickens-at-home.html
Thank you for posting that. It is well written and the photos are a huge help. We have one turning 16 weeks this weekend and he's holding up integrating some others into the flock because of his attitude. The hubby is done putting up with him. Darn. I kinda liked him. Lol