The enclosure was not very pretty to look at. I used some mild abrasive to clean it up.

And the side:

It came out like this:

The "function" knob has a black plastic cover. The other knobs do not. From an eBay advert of a similar system, I've learned that all knobs should have a little cover. I used a bit of moldable plastic that I painted black to make some new ones.

The BNC connectors have turned black. I cleaned them in my little ultrasonic cleaner. Then it dawned on me they were silver! But they cleaned up nicely.

The end result is already a lot better.