Over the last days.....primed bottom skin and rivet in place with 3 different size, 613, 414 and 410 rivets. I ran out of 613 rivets so I had to go to Bushcaddy to get some. Mike told me that the plan call for 613 rivets on the curve section of the bottom skin (3 places each side ) and on the middle row only at the intersection of the 3 skins. The middle row goes with 414 rivets. In my case, I had already drilled all the 3/16 holes so it was too late. Reinstall the landing gear to be sure everything is straight. Spent a few hours to mount the tires and tubes on the wheels