We have determined the nutritional value of oil for frying based on a retention value of 10% after cooking. Amount will vary depending on cooking time and temperature, ingredient density, and specific type of oil used.
You can marinate chicken ahead of time by putting chicken and marinade in a plastic bag and freezing. When you take the chicken out to thaw in your refrigerator, the chicken will marinate as well as thaw.
You may find that the eggplant, cheese, and tomatoes create a watery mix on top. I tend to spoon this off like you would gravy and then discard it before serving so that the dish isn't too watery. It all depends on how much oil the eggplant has absorbed during cooking and how well you drain the tomatoes.