Third agreement here that this is a bad, bad, BAD idea. Poultry releases a LOT of juices (that's where the gravy comes from), & except perhaps for making toast or baking pizza, your oven racks aren't meant as cooking implements.
In fact, I don't even like those cheap throwaway aluminum roasting pans. They're almost impossible to work with - & sometimes dangerous - when you're doing something as large as a turkey. I don't know where you're located, but if in the U.S., surely you must have a discount-type store (WalMart, K-Mart, Target) nearby where you can pick up a solid yet inexpensive roasting pan that will serve you for years in many other capacities?