Market Meat helped me put together a turducken for Thanksgiving. We used a duck breast, a chicken, another duck, and then the turkey. All the birds were professionally brined and deboned. We used cranberry Apple Walnut sauce, spicy sausage, breading, tons of herbs, premium olive oil to stuff the bird(s).
If you are interested in putting one together for Christmas, Market Meat would be more than happy to help you. This Turducken with labour cost me $300 after tax. All you have to do is put it into the oven. It will comfortably feed 25-30 normal people. In my case, it only fed 15 people, but some of us ate like vacuums.