Not much time to work, busy week. Need to have a simple and quick task for the night.Completion of the canopy strut aft attach brackets -- good choice.
Fabricated a couple of backing plates with nutplates to place behind the longeron and facilitate the screws without needing to use a wrench in an awkward way. The plate floats, not fixed to the longeron.
Used two layers of spacers, optional, to move the strut in-broad of the canopy frame flange.
Haven't ruled out adding a third-hole above the other two, to solidify a little more.