Brief Description: Putting on the pants - strut fairing
Just as the plans said, these may be warped. One was straight, one was warped, not sure it matters. This is one of those spots where the directions in the plans are insufficient but that's why it's called building.
Using a couple of aluminum angles worked well for me here. It allowed the fairing to be aligned, clamped, and a straight edged sanded on the trailing edge.