Early in the week the left and right rear spar assemblies were completed as outlined on page 14-03. Rear spar doubler plates and hinge assemblies were riveted to the rear spars along with tip attach angles. Later in the week we were finally able to make room to bring in the main spars and start assembling the wings. The Cessna project was sent off to have avionics installed and the chapter hangar was rearranged to free up the large table on wheels for wing assembly. This table was earlier used for building components of the chapter's Zenith 750 Cruiser Veteran's Build project. That aircraft is pretty well along and no longer needs the table. Once everything was arranged, we brought in the spars and began work on section 13. Some of this section had been done earlier including steps 1 and 2 on page 13-02 separating and prepping attach angles and doublers. In steps 3 and 4, the left rib doubler had already been riveted to a rib, but otherwise those steps were completed match drilling the doubler to the first inboard attach angle. More attach angles were riveted to the spar as described on page 13-03 steps 1 through 4. Existing attach angles already mounted on the spar also had rivets added to the web of the spar in step 5. Meanwhile, it was discovered that small ribs for the flaperons had not yet been prepped and primed so work was also begun on that.