Forehead plate and mystery bracket

I've printed, sanded and assembled the forehead plate and bracket.

I was thinking that I should replace the dummy clamps on the bracket with holes through the bracket and plate that you put a steel wire through. Originally I suspect the bracket was simply stapled on to the plate this way. Perhaps the original plate was made of cardboard or soft plastic you can staple through?

These printed ones turned out looking pretty good and if I glue them in place they probaly won't come off.

Then again, nothing beats doing it the same way the originals were made, I'll have to think some more about this.