Looking for the project on the site that has a gas tank filler flap in the trunk pan

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Guys, I'm hoping you can help me out. I think I saw one of the recent projects with a flap to get to the gas tank filler so you can fill the tank with gas from the bottom of the trunk pan instead of outside of the car. Thinking about doing the same thing but I can't find it anymore. Anyone have a clue which project it is? Thanks!