The fuel tank was placed by cutting into the cockpit (not canopy), and the painted canopy hid it. Also, I wanted to add that I didn't like the retract installation method. I had one like this on an Escape, and the gear pulled out of the wing pretty easily. My next plane was a Boxer 60, which used a false rib under the wing skin and it worked great. Because the skins are already on the Saphir, I drilled the holes for the dowels with a sharpened copper tube to get a good snug fit, and then used ProBond glue everywhere wood touched foam, after wetting it. The plane hasn't flown yet, so I don't know how this worked, but it was the best I could come up with.