Began construction of VS rear spar. Drilled & clecoed the upper & lower spar channel, and fore and aft spar straps together. It came out fairly well, though a couple of the drill holes in the channel got a bit enlarged and out of round from being drilled through. I'll ask Sonex how to deal with that.
I still have more assembly and fitting to do on the spar before final assemby and riveting.