If There was a plan, I would share it!
I just made it up as I went along…
main box is 3/4 inches,
the inner box is 3/8 inch
Both lap jointed, using gorilla wood glue.
Not a nail or screw in either box.
the bottoms of both boxes fit inside both boxes.
Just make the top slightly larger than your
the top is the same ogee router bit as the
bottom molding, I just cut a 3/4×3/4" piece of cherry and ran it through the router table.

Steve Tow