Richard, I like the way your tray inserts are shallower than the actual sides of your drawers. The biggest problem I have with those shallow drawers in the Festoy storage boxes is that it is so easy to not judge the extent the drawers fcan be loaded. If a tool does not fit perfectly, it becomes a very annoying process to get the drawer opened. It never seems to be the same prceedure as before to get a drawer opened. you have made the allowances that one does not run into such problems.
Great job, as with all of your solutions.
Tinker