I was looking for a handle that can be placed on the edge of the box and with a strong connection with the box. The handle itself is not that hard, but the hinge with the corner/edge placement is probably something new (at least I couldn't find one to like ;-) . The SketchUp Maker 2017 file is also attached. Feel free to use it if you need adjustments. If you don't need the double pin on the sides, you can create another STL export as you need. The pin is using a cross shape, just to ensure more walls and be stronger.