Generate a patent-style comparative schematic line illustration in black and white only. Show multiple conceptual configurations of the same modular protective system for an electronic device. Each configuration represents a different embodiment while maintaining the same underlying architecture composed of a base chassis, front frame, and rear panel. Variations may be indicated by relative layering or proportion only. Do not include dimensions, materials, performance values, or specific implementations. Use abstract, clean line drawings appropriate for an invention patent. Avoid product design aesthetics, avoid realism, avoid rendering, avoid shadows, avoid gradients. Patent diagram style only. Ver mais