Today I made big progress, at least visually. The morning was devoted to priming all the parts. This step went quite well considering working with a paint gun was a first for me. Although a professional painter would not be as happy as I am with the result.
The paint and the gun are quite easy to use, I chose a HVLP gun which reduces painting mist and runoff risks.



Then another big step, the first rivet : it's painted orange just to remember it.



Then I assembled the rear spar, Guillaume squeezed a few rivets.



And here is the finished spar.