I just read this article (via Hackaday). I think it’s quite clever and would be fun to see if it can be reproduced and improved upon. The main weakness of it, I think is that the distance between the eyes is not adjustable. How would you solve that problem while keeping the design simple enough to DIY? Adding some form of LED lighting would also be an improvement.
Something like this would be handy to have for the electronics area. While we do have the USB microscopes, some people prefer optical and find it easier to “look down at” what they are soldering, e.g. instead of looking at a screen.