I have designed an enclosure for my KORG NTS 3, so it won't look and feel so flimsy, hence the bulky 80s design.
The build simply encases the device. The buttons cover works without them but if you put 5 small pieces of foam of double sided duct tape inside it's gaps, the button action would be optimal. Also not required, but I have cut a small piece of transparent plastic for the LCD and glued it on the back side of the top cover.