rock wall panel 3d model

Create a 3D model of a side wall panel for a display case, 12 cm wide and 20 cm high. The panel must be a single solid rectangular piece. The back surface must be completely flat and smooth, with no rock texture, no bumps, and no relief. Only the front surface should have rough natural cave rock texture, with organic stone shapes, natural cracks, and uneven rocky relief. Make it a single-sided rock wall relief, like a bas-relief sculpture on a flat panel. Keep the overall shape a clean vertical rectangle. Suitable for 3D printing. Realistic dark gray and brown cave rock. No extra objects.