Parcel shelf in...
I was going to buy a bead roller but preferred the look of circles as opposed to lines/ridges. So after trial fitting the two panels and messing around with a home made stamp with little/no success I decided to cut the holes and back them with some thinner 22 gauge sheet metal using some JB weld (metal epoxy) and spot welds. This will give the desired look and also create the necessary rigidity.
Spot welded in place and then re-made the upright supports between shelf and window.