I want to create a “lid” that is recessed/sits in the mini ledge of this box. The edges are curved so I was wondering if theres a way to create a “rounded” rectangle with the same curves as the ledge.
The answer to the first question is most likely to work at a larger scale while drawing the box. I question whether the edges are all coplanar, however. How did you go about drawing the box in the first place?
As for creating the lid to fit in the recess, Once you’ve got the box geometry correctly drawn, it would be a simple matter of copying the appropriate edges to use as the shape of the lid.
Perhaps you could upload your SKP file for the box?