One question...

Theme: Front panel

How do I create rounded corners?
First create a rectangular front panel. Then you can round off the corners:

Round corner

You can also make many other changes to the contour in this way. The outline of the front panel just needs to be a closed sequence of lines and arcs at the end.

Instead of drawing the contour yourself, you can also import a DXF into the "Front panel (Contours)" layer.