These were mentioned on Festool Owners Group:
and look to be a very nice option (I was despairing of what I’d use when I ran out of the Windsor Brass hinges I’ve been using)
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I thought that smart hinge looked familiar. @Griff built a pair for this project.
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It’s always funny when you go to like a post from years ago and see it’s already 
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The creator of that system also has a little website for highlighting his ~40 years of box making: https://fine-boxes.com
Can confirm, those are some fine boxes. If I can manage to make something 1/4 as beautiful, I’ll be plenty happy with my box making abilities 
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That slide show is some fine boxes. In the slide show was all wood wind instruments. I wonder if he makes boxes for other instruments.