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That's what I was thinking, reverse the angle iron so the edge is seen instead of the flat. Then glue/expoxy the mirror to MDF. You can then mount your hardware to the flat back of the angle iron.
I was picturing it in my head then @josho came along with exactly what I was thinking. Freaky.
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Yep correct, I think that’s whats happening in the photo you posted. Also I didn’t weld the frame mitres as it had to flat pack and go up some stairs. As long as the cuts are decent it doesn’t matter too much as you don’t really see the top/bottom joins, just the face. the mdf backer holds all the frame components in
Non blurry photo
I’ve made something very similar using angle section. I backed all the mirror onto 15mm mdf. That way you can drill and countersink the back of the frame to screw into the mdf and secure the mirror. Then hung the whole lot on split battens / French cleats. Also allows you to space the mirror away from the frame so there is no glass to steel contact, with a classy looking shadow gap