Externally deflecting magnets provide a protective region around space vehicles which shields them from the hazardous space radiation. The magnetic shield simulator (MAGSIM) is an analog device that provides a simple means for directly measuring the forbidden volume or protective region produced by externally deflecting magnets. The MAG SIM has been employed to determine the protective volume for certain complex magnet configurations. These configurations include two coplanar coaxial current loops of different radii, and two quasihollow conductor configurations. In addition, the assumption of substituting an equivalent simple loop for a hollow conductor has been checked. In general, the simple-loop approximation predicts results in agreement with measurements with the hollow conductor magnet; however, the measured outward displacement of the forbidden volume from the center of the magnet is approximately 20% larger than that predicted by simple-loop theory. The ability to shape the forbidden region to match the shape of the vehicle is described.