One of those nights: over an hour to squeeze six rivets and install one nutplate. I had to drill them out several times each because a) I thought I had them in the wrong holes b) I thought I had them the wrong way round c) I thought they captured the nose rib and had forgotten to put in it (when they don't) d) I thought I had them the wrong way round again, etc, etc. Eventually I just came back inside to study instead; my mind obviously isn't on building at the moment. On the bright side, I didn't do any damage to the holes: if I do say so myself, I'm something of a master at drilling out rivets!! Cleco'd the spar to the front/nose skin and left it at that...