Marked where the R/H wing fuel sender is on the top skin. Cut a 3 1/8" hole and made a 5" cover from .040 aluminum for the fuel sender access. Drilled the fastener holes in the fuel sender access cover and matched drilled to the skin. Drilled the holes to a #19 on the cover and dimple for #8 screws. Made the L/H wing fuel sender access cover at the same time. Installed cork in the fuel tank bay. The fuel tank fits perfect, nice and tight. Put the top skin on to check the fit around the fuel fill tube. Needed to sand one side of the hole to get the skin to fit. Because of the gap decided to make a close out cover for around the fuel fill tube to finish it off. Laid out the cover from .040 aluminum.