I have redrawn the holes and also added a "lip" or end flange where I can fix the main box end sides.
I then added the original lid (box2-upper) and noted that the dimensions are no longer the same. How can I up-size the bottom 2 parts (part 1,3) to be the same measurements of the original size?
Also why do I get the error message of the new end flange I added?
I included the new box with all the holes as well as the original box with lid.