I tried to work out how to fit all the components inside the blue box, but decided that it was just too crowded. Instead, I am going to mount everything on a 24" x 12" wood backboard.
Also will make two aluminum panels, one for LED status indicators, the other for machine cable connections. The status panel will mount vertically at the right side of the backboard, the connector panel will sit horizontally along the bottom, with the cables exiting downward.
I'm using FreeCAD to create 3D parts and the backboard and panel layouts. I will post everything in the files section.