It's pretty straightforward. Take a sheet of the mesh, cut it to size, bend a top and a bottom lip. The trick is in the corners. If you see my arrow, you will notice a little bit of a bunching-up of the mesh. I assume that the mounting lip is cut off at this point and the mesh is simply hand rolled into the shape. For the lights the mesh is cut, and then the mesh is slit multiple times from the center outwards towards the edges of the lights. Then the multiple slits can be bent into a round form.