Thanks, guys.
More pixxors!
The home-made brackets. Flattened & bent copper pipe, aluminum rivets. Yes. I drilled into the hatch. The sweet, pristine hatch! Oh well. I need to seal with silicone and paint these black.
Detail of the underside. I glassed in that cross member to stiffen things up. The trailing edge was a little flappy over bumps before I did that. I'll just be brush painting flat black under here. You can't see the crossmember standing behind the car - you have to get underneath and look up.
Detail of the leading edge. 5 screws up top, and there will be 2 or 3 screws per side as well. Hopefully I can find some kind of trim button to put over them to make it look a bit more pro. (Pro would have been fasteners on the underside only...) That's a strip of black duct tape on the side to protect the paint because I've been un/re-installing this multiple times while constructing.