Riveted bottom skin to bulkheads, and riveted about half of the rivets on the bottom that join the side skins with the bottom skin. I could reach some of them. Got my neighbor to help out for about 30 minutes with some of the bulkhead to bottom skin rivets that I couldn't reach. Thought I could reach the rest, but the height of the side skins make reaching some of the side skin to bottom skin rivets impossible. I'll have to get more help to finish that up.