The aileron system starts with cutting the access panels for the bellcranks. Bellcranks are basically ratio pivots which converts controls movements direction by 90 degrees from lengthwise to the spar to chordwise in order to move the ailerons
The bellcranks (i.e., the kidneybean shaped plate) are held by these freshly painted brackets.

In the background is one of the plywood mounting plates I cut for my Whelan Nav/Strobe wingtip lights
Here is the port bellcrank in situ on the spar. The bottom picture shows the attached push rods, the white rod bringing the control stick movements into the wing, and the grey rod going the aileron.