Different size boxes nesting for transport

forgive my crude pictures but threw it all together in the slicer to mock it up ... just using the large to medium handle bracket and side connectors. Sadly the holes don't sign up to put stuff "in the middle" and make it all even HOWEVER may get the idea across. i forgot to attach a lid to the large box to see if it would clear or not but the bottom of the bracket would need to be able to have enough space to have a lid on the larger box below it. and of course the holes to line up somehow.. Then the side bars would need to either be modular depending on how high the next level box is or just make different sizes for the different heights of the smaller nested box above. and maybe even a medium to small to get them all to nest. This is purely transportation boxes wouldn't open or slide but for say card/board games with multiple pieces that would take different size boxes (large for gamma but medium for cards etc) Then the top box could get a handle and be able to carry the whole thing or if no handle at least it would be good for transportation. I only put 1 side bar on mine for ease of use but would need one on each side of course and maybe different holes to line up to the nested boxes above... maybe the bottom connecter to have 3 holes instead of 2 so it will hit in the middle of the box