Can you please tell me some rules of thumb that you use when placing the skybox in your games, i.e. when deciding to what value to set xmin, xmax, ymin, ymax, zmin, zmax?

Is setting cube vertex coordinates to (+/-f/sqrt(3), +/-f/sqrt(3), +/-f/sqrt(3)) + V_camera, where V_camera is the position of the camera, a good idea?