I have recently become obsessed with chicken stock/bone broth. I usually use wings and other parts but had time to go to the Asian grocery store to get chicken feet today so I decided it was time to try it out. I also happened upon some chicken necks. I've read a few threads here on cleaning and what not but is there anything else to consider? Do I need to roast them beforehand? I'd like to make a very large batch and freeze it. I plan to use a 12 qt stock pot which I imagine with all of the solid would yield about 6 qt of actual liquid stock. Would 8 lbs of parts be a good ratio?