Cleco'd in ribs on left tank, wasn't too bad, started with hole in nose on top side, then hole in nose on the bottom side. Went up from there. Fabricated tank stiffeners, including the two inboard stiffeners that are slightly shorter than the other 10. Cleco'd in stiffeners on left tank, then match drilled. Started clecoing the right tank, and got all the clecos in the top and bottom forward most hole. Started to put the remainder in, but got tired and a cut on my thumb from trying to put that pressure on to get the clecos in. Called it a day. And that makes 240 total hours so far, averaging 40 per month for the first 6 months of construction.