I have found a way to round the edges of a control panel....
Once it was cut to the right width (using the laminate knife mentioned above) = I tape an existing control panel to it and use it as a and use that as guide to sand (using the disc on a belt/disc sander and then finish by hand sanding). The harder control panel will not sand anywhere as easy as the aluminium - then move the control panel down to get the length I want, tape it down again and shape the other end.
The same taping allows me to easily drill the screw holes etc as well.