In a very large pot put small amount of water in bottom of pan and bring to a boil. Place rack in the bottom of the pan. Chicken goes in first, rib side down, with a layer of cornhusks on top. Cover and cook for about 5 minutes. Then, layer the corn, lobster, shrimp, clams and potatoes on top of the chicken. Cover and cook until shellfish is pink and chicken is cooked throughout.