Thanks, Ross, Josh, David and Carl. Yes, the flange is simply a piece of 3/4 x 3/4 x 0.063 extruded 2024-T3 angle. It is notched to make it easy to make a smooth bend and remain flat, and attached with a little Hysol & countersunk solid aluminum rivets. I made short work of the notches by setting it up on my little milling machine and using a small (1/8") end mill. It's a totally unnecessary mod of course, and does add a little weight to the panel. On the plus side, it adds rigidity and a nice way to attach the glare shield, as pointed out by Josh. I drilled the evenly spaced holes at the start, and will use only the ones that prove to be necessary to help the glare shield lay down nicely. I'll insert Tinnerman nuts in the ones I use. I'm always flattered when someone uses something they saw that I had done... and this is certainly nothing very original, anyway.