@LI-Rick I'll hammer and dolly the corner a little more, to bring it out a quarter inch at the apex and smooth the folds, then run the edge through the bead roller and/or use a shrinking disc. They'll go away.
As it turned out I missed my mark at the front of the piece, mistakenly thinking I had a little wiggle room up there. So I had to remove the fold and then fold it over again about a quarter inch inside. I cut the buck down just a skosh to avoid that mistake on the next one.
Test fitting again...
Basically we're there. I still have to turn that inside edge under; I made a little guide out of aluminum tube to aid in that endeavor. Then just smooth out the wrinkles on that corner and a tap out couple little dings on the leading edge.
I got some galvanized steel stock to make the pin holders with. The sockets will be the same things the Speedsters use to plug in the side curtains. I need to source a couple more German Tenax buttons and drill with precision to locate them on the front of the piece.
I think this is going to work.