Here are some more of the brackets.
It was a PITA to get the stainless to bend in just the right shape but nothing a good hammer couldn't sort out.
I'm hoping I won't get any flutter at speed. There is a small gap which will go away when I find a moulding. In the meantime, some foam draft seal should do the trick.
I haven't had a chance to test it yet. Will do soon but probably no a-b-a.
At least not yet.