I still have a lot of work to do on the front of this display before I'm going to be happy with it, but the real secret is the other side.
I use the underside of the display at the back to store my cash box (unlocked and open so that you can see it), and also my packing supplies as can be seen in these two photos.
Under the table itself is a large box, which hold cardboard jewellery boxes of various sizes (sorry, the photo did not come out).
By having this hidden area at the back of the display, I can keep thing out of sight, such as cups of tea, food, etc. From this partial side view, things can not be seen.
This photo from a recent craft fair, shows the stall and the display, and also it's smaller sister (more hidden secrets under there as well).