[dsraven]

here is mine. 04 envoy parts but shaped to fit. just an idea of how I kept the filler higher than the tank as much as possible for ease of filling without the burp back. used the stock filler neck as well, just shortened. the door was pretty flat before I started but the door also easily comes off the hinged backer so it isn't that tough to reshape. the harder part is getting the surrounding metal frame, cut from the donor, to fit the fender shape.
still need to make a rock guard for the inside of the fender area.