Battery switch plate

This is a trim piece / cover for a rather large on/off battery switch that can be found on Amazon under the term " Ampper ".

The switch comes ready to mount as a surface mount unit, however, you can also panel mount it by drilling a large mounting hole (and 4 smaller ones) and pass the bolts through the panel into the switch housing. This may not look quite as tidy as I had wanted, so I designed a VERY simple switch plate to cover the installation.

This plate also serves as an ideal mounting / drilling template for the installation process.

The design was done in FreeCAD and as mentioned it is fully parametric. I have included the FreeCAD file so that you can modify the design to your heart's content.
I am open to any suggestions as to how to improve the design work-flow in FreeCAD.