Brief Description: Add L angle stiffeners to underside of upper panel
I cut the L angles to length last night. Tonight, I finished adjusting the length and then installed.
I first drilled a #40 pilot hole in the forward end of the angle, then cleco'd that to the firewall / panel junction. I then positioned the angles so I could see the blue marker line in the existing holes, and pilot drilled the holes.
Note: the two outboard angles had to be fluted to allow a curve to the angles to match the upper panel dimensions.