I installed the flap channel and backrest brace in the fuselage, and connected and tidied all the wires for the flap motor, positioning system, and cabin speaker:
The travel allowed by flap positioning system is well-matched to the actual stroke of the actuator. After some adjustment, I was able to get essentially the maximum amount of travel the motor can achieve, but now it's under quasi-automatic control.
I hung the flaps on the wings once again:
This time I safetied the hinge pins:
Installed the flap pushrods and torqued/marked all the fasteners. Here you can see the rudder cable guards paying dividends – they allow the bolts to be inserted like they appear in the picture, instead of from the opposite direction which would be a whole new level of difficulty:
I temporarily installed the flap covers to keep stuff from falling down there and disappearing forever:
I will triple-check the rigging in a future work session, but I should now be able to use the flaps as a neutral reference for the ailerons, which will be useful when I go to install the wingtips:
And finally, here's a video showing how the flaps move automatically to the next position with each click of the "down" switch, followed by full retraction when the switch is moved to the "up" position: