Here are the completed wing rear spars. I just finished riveting them this morning before catching a plane to Wichita.

Here is a close up of the left rear spar inboard end. There are reinforcing plates to transfer the loads from where it bolts to the fuselage (right end) to the rest of the spar.

Here is a close up mid span portion of the left rear spar.

You can see the reinforcing plate where the inboard aileron hinge mounts.

There is a similar reinforcing plate at the outboard end where the other aileron hinge mounts.

The empty rivet holes will be used to attach the aileron hinge bracket and a wing rib.

The large hole is there to allow the aileron pushrod to go to the aileron.