This is a connector system for boxes in various sizes. It contains a outer and a inner part as well as an hole part. These Files contain their own support structure! Please level each item for your self. All you need is a number of M5 Allen-Screws (min. 40mm long). And 9mm self locking nuts for the inner parts. While constructing you have to drill through the edges of each board, to clear a hole for the screw. The construction is a bit tricky but it holds a lot of weight. Feel free to add or remix this design.