Arrange chicken bones and feet on a large roasting pan
Roast in the preheated oven until bones begin to brown, about 45-60 minutes
Transfer bones to a giant stockpot along with the vegetable scraps, vinegar, peppercorns, and bay leaves and pour in enough water to cover bones
Bring to a boil and reduce to a skimmer, skimming the top to get off the impurities that bubble up to the surface. Cover with the lid and simmer for 10-12 hours, adding a tablespoon or two of salt halfway through.
Strain broth through a fine-mesh strainer into a container. Refrigerate or freeze after cooled. Broth will be good for 3-6 months if frozen.