6.0 hrs
Match drill tank filler flange.

Match drill drain valve flange. You'll notice this was on the wrong side. After figuring that out, it was moved the other side and match drilled one more time. The narrative says to countersink this piece. But mine was already done. It would have been awkward, since there isn't enough room to get the countersink cage on the part. I continue to notice little odd (but nice!) differences between this kit and those of even just a couple of years ago as documented by other builders.

Fab vent line retainers

Fab and drill cap for outboard rib tooling hole. Dimple cap and rib. Scour for prosealing.

Disassemble tank
Debur all ribs
Debur stiffeners
Rough up bottom of stiffeners
Debur tank skin
Mask tank skin in prep for scouring