Spent several hours work with my friend Ross on the rear spar. Riveted in one of the doublers, and worked on the one of the wing rib attachment assemblies. Discovered a possible plans error on page W15, it calls for a 1 inch screw, but that seems two short as it does not allow for 1 1/2 threads to be exposed above the nut. Looks like it needs 1 1/8 inch screw. Will post on build forum and contact Sonex about it.
Rear Spar Doubler Diagram 
Doubler in Spar Channel
(not riveted)
Doubler Clecoed and one rivet in 
Shan riveting the doubler 
Doubler Rivets in Place 
Diagram for Spar attach assembly 
Assembly bolted onto rib, some clecos holding portions in place