John Harmons sells tank skins that size. Why reinvent the wheel? The photo is an F1/F4 builder (not me) standing next to the tanks using John's larger tanks skins.This is how I plan to do the big fuel tanks (75 inch skins) on the Rocket, but I have never done it before. I'd sure like to shortcut the learning process and see pictures. Do you clamp the pipe to the aluminum to keep it in position on the LE, or something else?