I cut the hole in the center sub-panel for the GTN750 tray. Deburred the edges. Mounted the instrument panel with the tray through the center sub-panel. Located and marked location for 2 aluminum angles to support the tray. Since the center sub-panel has a bend in it that is horizontal, I had to cut a slot in the angle to bend it to match thecontour of the sub-panel. I drilled the AN470 rivet holes in each angle and the screw holes that will mount the tray. I deburred the holes and primed the support angles. Last I riveted the angles to the center sub-panel.
