1.5 hrs. on brackets...

On advice of counsel (Jean @ TAF CA) I removed the two sharp inside corners.

Rivnuts in.

Now to locate it on the sub-panel.

My mini airplane. ;-)

Starting to match drill...

What's under those holes...

Cleaned, deburred and riveted!

While it's pretty solidly in place I will add some diagonal straps from the back of the sides of the unit to the top of the sub-panel.