All the main ribs are now sanded. Before beginning the priming, I began assembling the leading edges and the fuel tanks. See those entries.

Not so funny work, sanding the main ribs. It took two hours to do a wing and a half.

Construction of the wing stand. It's just two vertical posts fixed to the workshops frame. Then each on each post I screwed a horizontal piece of angle to support the main spar. Normally I should be able to work on both wings simultaneously. On the picture the spar is not yet blocked on the supports, first I'll have to square everything.

Here is Van's answer concerning my drilling into the main spar : this is a quite common error, just drill the two remaining holes in the rib and use six rivets instead of four.

After having found about my error from yesterday, I decided to tackle a less error prone task: removing the blue plastic protection on the skins rivet lines.