I wanted to install my louvers without a rivet showing, so I took this route. Stole this idea from another member here and I apologize for not remembering the user name. So credit goes to the unknown member that got me started down this path.

I contemplated using the epoxied studs on the body, but ended up using industrial velcro. I measured the thickness of the velcro to give me an idea of how much gap to have on the backside.
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This is the stuff I'm using. Once stuck to the body, it felt very secure.

I then started bending the tabs up on the louver.
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Once I had all the tabs bent up, I was able to create a template for the L bracket.
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From there, I just transferred the template to the L bracket and ground slots where marked.
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A little trimming and the L bracket sits on the louver quite nicely. Then just bend the tabs back down.
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I had even 3d printed a gauge for the thickness of the velcro. It's off by about .008, so don't rely on that for an accurate.
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Hope this gives some options for people. You could still use the studs epoxied to the body this way. This just makes it so you don't have to rivet the L bracket on.