The Jet City JCA20 comes with a "Marmite" front, you either love it or hate it. I am in the latter camp so decided to do something about it. At the same time I changed the knobs and the guaranteed-to-fail blue lamp. The panel was MDF and the cloth was from a previous project giving an old Peavey combo a face lift.
The whole surface had contact adhesive rolled on and when firmly stuck down staples were banged in at the rear to stop edges lifting. I wiped the back panel over with some blue fountain pen ink as a colour wash as you can see this from the back. I did try some black chicken head knobs that I already but you just couldn't see where they were pointing.
The bottom edge of the new front had some router-love in the way of a round-over bit on both the front and the rear of the panel. The one on the back of the panel, though not visible makes a good gap for air-flow.