The only thing I accomplished yesterday and today was fitting and match-drilling the fuel filler cap and drain valve flanges. The only area which requires more-than-usual care is making sure that the curavture machined into the filler cap flange aligns with the upper tank skin curvature. Holding the flange approximately in place against the skin and rotating it slightly will give you a feel for where the fit is best. Once the rotation is correct and the opening is lined up, clamp and drill.

Looks good with the cap in place, huh?

Sorry, no pictures of the drain flange drilling process.