Call John Taylor at Taylor Machine 253-445-4073. John rebuilds old Winchesters, and his work is outstanding.
As far as draw-filing the metal, don't. In working although rough condition, that rifle may be worth quite a bit. Drawfiled and buggered up, it will be worthless. If you are unwilling to put the money into it to restore the rifle, you can sell it as-is to a collector. John Taylor knows several collectors, he may be able to help you find a buyer.