My brother-in-law Tony Malley dropped by to day to help me hang the flaps. This was a big job, as the pins were pretty stubborn. I learned to quickly give the hinge pins a pass down the ScotchBrite wheel, and lube with Mouse Milk.
With the flaps hung, we moved to the fit-and-trim phase.
Left flap hanging freely
Piano hinge seated...
...and stowed (later I corrected the skin/pin overlap)